uncleflo

profile picture

Some cool dude. Higher order of decision making. Absolute.

Registered since September 28th, 2017

Has a total of 4246 bookmarks.

Showing top Tags within 36 bookmarks

howto   information   development   guide   reference   administration   design   website   software   solution   service   product   online   business   uk   tool   company   linux   code   server   system   application   web   list   video   marine   create   data   experience   description   tutorial   explanation   technology   build   blog   article   learn   world   project   boat   download   windows   security   lookup   free   performance   javascript   technical   network   control   beautiful   support   london   tools   course   file   research   purchase   library   programming   image   youtube   example   php   construction   html   opensource   quality   install   community   computer   profile   feature   power   browser   music   platform   mobile   user   process   work   database   share   manage   hardware   professional   buy   industry   internet   dance   advice   installation   developer   3d   search   access   material   customer   travel   camera   test   standard   review   documentation   css   money   engineering   develop   webdesign   engine   device   photography   digital   api   speed   source   program   management   phone   discussion   question   event   client   story   simple   water   marketing   app   content   yacht   setup   package   fast   idea   interface   account   communication   cheap   compare   script   study   market   live   easy   google   resource   operation   startup   monitor   training  


Tag selected: light.

Clear all

Showing 36 results.

Looking up light tag. Showing 36 results. Clear

Concrete pontoon float (BP300) - PONTON

https://ponton-shop.lv/Catalogue/concrete-floats-pontoons/3000kg-floats-pontoons/concrete-pontoon-floats-2/

Saved by uncleflo on November 14th, 2022.

Concrete pontoons stand out in contrast to other pontoons for its stability and durability. The concrete pontoons are filled with foam plastic and are resistant to freezing in as well as to salt water exposure. The pontoons, from the heavier breakwaters made of concrete to the lighter ones made of wood, are designed to last for 30-50 years. The all concrete and styrofoam construction of the pontoon produces a very high degree of buoyancy thus making it virtually unsinkable. It is practically maintenance-free and has little or no impact upon Nature and the Environment. Each standard pontoon is designed to accept electrical and water supply services.

pontoon unsinkable styrofoam buoyancy foam cart resistant concrete maintenance environment product construction marina exposure marine water boat durable float catalogue light


Easy Candle EC-12

https://www.easycandle.nl/store/index.php?route=product/product&product_id=64

Saved by uncleflo on September 6th, 2022.

Set van 12 Easy Candle oplaadbare led kaarsen met afstandsbediening inclusief inductie oplaadstation en adapter De Easy Candle kaars is voorzien van LED verlichting in combinatie met een speciale kleurcoating en Natural Flickering Technologie, wat zorgt voor een mooi en natuurlijk licht met een realistische flikkering: net als bij echte kaarsen. De kaarsen zijn inductie oplaadbaar: géén kwetsbare contactpunten. Er kunnen maximaal 2 oplaadstations aan elkaar worden geklikt met slechts 1 adapter. Functies afstandsbediening: On/Off, Auto-Off Timer, Brightness level, Candle flickering On/Off. De kaarsen kunnen ook handmatig aan/uit worden gezet.

flickering candle adapter timer brightness diameter product natural easy recharge commercial beautiful remote light special flicker order online shop


SEAC SUB SZ5000 BLACK - Duikcentrum Moby Dick

https://www.mobydick.nl/seac-sub-sz5000-black.html

Saved by uncleflo on September 6th, 2022.

Accu - Li-Ion 7800 mAh oplaadbaar via USB-C-aansluiting. Standen - Maximaal vermogen, verminderd vermogen en knipperend. Schakelaarvergrendeling om onbedoelde ontsteking te voorkomen. Gratis verzending (NL&BE) vanaf 65. Ma-za voor 16.00 uur besteld = direct verstuurd. Grote winkel in Rotterdam.

diving centre light product price flashlight scuba cart order purchase netherlands store information shop recharge


SZ5000, Seac Sub Spa

https://b2b.seacsub.com/seacsub/6/scuba-diving-lights/0500027/sz5000.html

Saved by uncleflo on September 6th, 2022.

Seac SZ 5000 is an underwater light characterized by high luminous power up to 4200 Lumens, ideal for both reef night diving or in environments where full visibility is required (cave or wrecks), and for underwater photographers. Despite being a very powerful light, its dimensions are relatively small: 65 mm in diameter and 178 mm in length enabling the diver to store in a BCD pocket or simply attach anywhere. The Seac SZ 5000 is made of high-strength aluminum with tempered optical glass lens and watertight NBR O-ring gasket. The light beam, with a width of 12 °, is 3 CREE SST 40 LEDs and adjustable from 1500 Lumens to 4200 Lumens. The burn-time is 2.5 hours at minimum power and 1 hour at maximum power. The flashlight is powered by an internal 7800 mAh lithium-ion battery rechargeable via USB-C (charge indicator on the battery itself). Seac SZ 5000 also has a flashing light function useful as an alarm / call to other divers. The electromagnetic switch is equipped with a safety lock to avoid switching on accidentally.

scuba light diving torch flashlight store online order information dimension small diameter enable diver power photography battery rechargeable product item manufacturer cart


Products Archive - Roof Maker

https://roof-maker.co.uk/products/

Saved by uncleflo on February 13th, 2022.

Thank you for your interest in Roof Maker. We’ve seen a lot of change in the industry since the Company first started in 2001. Roof Maker (RM) entered the rooflight market at the very beginning of the move towards wanting to allow more light into our homes. Every rooflight we sell has been designed and developed by us specifically to address maximising the flow of light into any room. In fact, in many cases adding a rooflight can dramatically improve the amount of light in dark rooms or spaces. We are and always have been passionate about our customers. When the business started, we primarily sold to consumers who were undertaking home improvements and renovations. As the number of rooflights we were selling increased, we began to capture important feedback from our customers. Consequently, each of our products has been designed and developed utilising these invaluable comments and suggestions. This has led to the creation of some of the best looking and most durable rooflights available on the market today. Every rooflight we manufacture is made to measure and built by hand in our own on-site factory. Our two-acre manufacturing facility has a 30-metre automated glass manufacturing production line, capable of producing argon or krypton filled glass units up to 3000mm x 1200mm in size. The company’s inauguration coincided with the government legislation on CO2 emissions and Roof Maker prides itself on delivering superior thermal insulation efficiencies. Energy-efficient glazing helps reduce the carbon footprint of properties. Roof Maker has seen these two areas become far more important in the purchase decision-making process than ever before. The products are designed and built using the latest technologies, with triple glazed options that provide one of the industry’s highest Ug ratings of 0.2. We can also offer double glazed units, in order to provide the option of a lighter alternative to triple-glazed products.

showroom sleek maker durability pitched roof flat virtual transform suite innovation registered view latest gallery supplies vision reality product case unique quality information home glass ceiling light design space manufacture deliver insulation beautiful transparant company profile business


Compact XFoil Board Claims It Can Reach Speeds Comparable to 500 HP Boats

https://www.autoevolution.com/news/compact-xfoil-board-claims-it-can-reach-speeds-comparable-to-500-hp-boats-179478.html

Saved by uncleflo on January 25th, 2022.

Compact but powerful, versatile, and capable of reaching speeds comparable to 500 hp speed boats, the XFoil is a three-in-one watercraft that allows you to ride on the surface of the water or fly above it. As fun as water sports can be, they are also money guzzlers. Especially if you want to make the best of them. Not everyone can afford to buy both a surfboard and a SUP (stand-up paddleboard), or a hydrofoil board, although it would be nice to be able to ride all of them. Designed in Silicon Valley, California, by PLX Devices, XFoil promises to offer the perfect solution: a watercraft that can serve as all of the above, while also making you feel like you’re in a high-performance speed boat. Everything is wrapped in a compact, lightweight, and durable package that’s small enough to fit in your mid-size sedan.

Marine water light powerful boat small transport foil fast capable speed surface craft sport surfboard surf board design electric battery performance fun thrill


SIN - Reunion, Integration & Debrief

https://www.tickettailor.com/events/foxandbadge/583108

Saved by uncleflo on January 17th, 2022.

“If you only say one prayer in a day, make it thank you.” (Rumi) This integration event is for all those who attended and co-created our SIN event on Friday 17th September. All hearts and voices are welcome. Magically, after the week begins with a Harvest Moon, our event coincides with the Autumnal Equinox, as we move from Summer into Autumn, and light into darkness. Night and day are of equal length, and in perfect equilibrium - dark and light, masculine and feminine, inner and outer all in balance. It is:-a time of harvest, reaping the crops and fruits of the land and our labour-a time to give thanks for all our gifts - for the harvest, and each other. -a time to recognise the great boon of community-a time of pause and reflection, and the chance to think of what new seeds we will plant, and what we will let go of. What do we want to nourish us in the months ahead? What new world do we want to build together?

autumn wholeness nourish magical ecstatic paganism harvest flame immortality beautiful reflection regeneration apple darkness sin light community event meetup london uk


jerryghionis.com - How to Wow

https://www.jerryghionis.com/how-to-wow-sale

Saved by uncleflo on January 15th, 2022.

Learn how to recognize and use creative triggers in any location to treat even a dull environment like a studio and create magic images. You feel like your photography is lacking an element of artistry. You often struggle when the environment isn’t inspiring to photograph. No matter where you are shooting, there will be elements you can use to create a unique and artistic image. In this course, I’ll teach you how to look for interesting light, understand how textures can add to your frame, and my posing tricks that will make it possible for you to create magic images in any location.

beginner adventurous textures confident shoot tricks magic image transform camera wedding amazing photograph environment photography create confidence location lighting unique dramatic understand howto learn course offer photographer teach texture picture studio element light


Boat Lightning Attenuation Onboard

http://www.kastenmarine.com/Lightning.htm

Saved by uncleflo on May 11th, 2021.

According to published reports, in the US out of the annual average of about 100 deaths due to lightning, approximately 13 are aboard boats. Suffice it to say that if lightning is a hazard where your boat will be used, a plan should be developed to deal with the possibility of a direct strike. In the Pacific Northwest lightning is relatively rare. In Florida, some areas annually have more than fifty strikes per square mile..! According to the well known lightning researcher Ewen Thompson, lightning can develop on the order of one hundred million volts, peak currents of tens of thousands of amps, and generate temperatures of some fifty five thousand degrees. Fortunately, it lasts only a fraction of a second, but within that time it can be deadly and / or very destructive. A lightning strike involves an extremely rapid change in an electric current, generating a momentary but extremely powerful magnetic field. This electro-magnetic pulse (EMP) will readily induce currents in adjacent wiring. Currents induced in wires by the EMP from a lightning strike may do some very weird things, such as fry every piece of electronics aboard. A strike nearby or on another boat can fry the electronics aboard your boat without even requiring an electrical connection or direct strike.

grounding equalization faraday lightning mast attenuation equalize ballast wiring electrode keel masthead watercraft cone stainless conductor superstructure dissipation electricity hazard volt destruction boat deadly cage magnetic wire marine light advice construction


Memory Usage Test to See Which is the Lightest Antivirus Software • Raymond.CC - Page 2

https://www.raymond.cc/blog/which-free-antivirus-is-the-lightest-on-system-memory-usage/2/

Saved by uncleflo on January 19th, 2021.

The result tables are simply split into two, one for the idle memory usage and one for the usage during a virus scan, both in alphabetical order. The colors are self explanatory with green the lightest antivirus and yellow second best. At the other end, red is the heaviest and orange the next most memory hungry. While these results obviously test the antivirus memory usage, they don’t take into account the features present in each application and its detection rates. Therefore you shouldn’t automatically assume lighter is better because a more memory efficient program might not have the amount of features of an antivirus using a few more Megabytes. If your current package is hungry for memory, this does give you a good idea of what the lightest antivirus packages are that you might like to look at a bit closer.

avast scan idle iterate anti firewall scanning geek memory lightness virus antivirus software review performance fast speed light usage experience


How To Install Fixed Portlights - YouTube

https://www.youtube.com/watch?v=MQyjxVUskd8

Saved by uncleflo on December 20th, 2019.

For details on materials used and other goods that had to be cut from this video, visit my website www.boatworkstoday.com

goods materials video boat marine window light port fixed youtube install howto information engineering construction report works demonstration


Reelight RL771 Bicycle Headlight and Tail Light for Seatpost

https://www.amazon.co.uk/Reelight-RL771-Bicycle-Headlight-Seatpost/dp/B00FSD2OAI

Saved by uncleflo on December 18th, 2019.

Front and rear light powered by a single dynamo. High intensity light for low light situations. Made in China. An effective product to use. Installed upside down fork and seatpost. The front and rear lights are powered by a single generator.. Headlight emitting a powerful light. Side lighting. Approved E6 reflectors. Does not require batteries. Fixes to a bike. No resistance - Always lit up, always safe - no maintenance required. If you are looking for a beacon that lights the road in places where public lighting is lacking, the RL700 is the most sensible choice. Its frictionless dynamo powers a headlight which emits a strong light and a wide beam on the road. The beacon emits light through a side of small holes, through an angle up to 270 degrees. The result is a greatly enhanced visibility in traffic. The front and rear lights are fitted with E6 approved reflectors. The front headlight is installed on the steering fork, above the front wheel, and the rear light is installed on the seat post. The front and rear RL700 lights are powered by a single generator mounted on the carrier. The magnets are placed on the rear wheel spokes. The light powers its own current with its eco-friendly coil and generator with magnets on the spokes of the wheel - no need for any battery. The light is attached to the bicycle: you never forget it. The light is always active and ensures greater safety in traffic, day and night. Through this magnet lamp, no more flat batteries, forgotten lights or resistance to pedalling. Nothing but a permanent lighting for constant security. The RL700 kit contains a headlight and tail light. Constant lighting: lights up when you ride and keeps going when you stop.

front rear light bicycle dynamo frictionless intensity situation china reflective product seat generator resistance maintenance reflector safety traffic visible beam road sport amazon


PRG-240T-7ER | PRO TREK | Watches | Products | CASIO

https://www.casio-europe.com/euro/products/watches/protrek/prg-240t-7er/

Saved by uncleflo on December 17th, 2019.

Full-Auto Illuminator: Automatically deactivates the Auto EL backlight function when surrounding light is sufficient, and activates it under dim light or dark conditions. Low-temperature resistant (-10 °C): Even temperatures as low as -10 °C have no effect on this watch. Solar Power: A solar cell provides power for operation. Duplex LCD: Giving you a constant overview: Elements on the display are distinguished from one another using colour. This is achieved using different coloured layers placed on top of one another, allowing information to be displayed more clearly. Digital-compass: A built-in direction sensor detecs the magnetic north. 10,000 m Altimeter: A pressure sensor detects changes in the air pressure and converts the result into an altitude up to 10,000 m. Height Gain: The height gain sums all the meters you have climbed in a session, so that you can see at a glance the total ascent on a tour. Sunrise/sunset display: After entering the geographical location, sunrise and sunset times can be displayed for any given date. Barometer (260 / 1.100 hPa): A special sensor measures the air pressure (measuring range: 260 / 1100 hPa) and presents this on the display in the form of a symbol. This enables early detection of weather trends.

casio watch metal compas adventurer weather solar energy altimeter light automatic time armwrist temperature power operation digital direction north sunrise sunset pressure sensor aviator


Marine - Victron Energy

https://www.victronenergy.com/markets/marine

Saved by uncleflo on October 11th, 2019.

Whether you are a leisure or a professional sailor, you know how important it is to have a reliable power supply so that your electronics continue to function properly - especially far out at sea. Victron Energy offers a broad range of equipment designed specifically with you and your on board power system in mind. We proudly present to you a new era in freedom and independence. 'Service' batteries provide power for everything except for 'engine-starting'. Demand for on-board electricity has to be matched with an adequate battery bank. Lithium Batteries provide the best solution for high power demand. Compared to lead/acid technology they are smaller and about 70% lighter for their capacity. They can be deeply discharged, without harm. More current is available throughout the discharge cycle …and they can be cycled thousands of times - resulting in a much longer service life. It is also 'easier' to drive power back into Lithium batteries - so charging-time is reduced.

lithium battery navigation discharge unlimited boat ship marine sailor sailing power supply power electronics energy equipment board freedom independence service technology solution compare smaller resulting time reliable bank light current cycle demand electricity lead acid life products shop order online enguire information


PINAMP Mini DIL Optical Receiver Modules | OSI Laser Diode Inc.

https://www.laserdiode.com/standard_products/product/pinamp-optical-receiver-modules

Saved by uncleflo on August 26th, 2019.

OSI Laser Diode, Inc. (LDI) PINAMPs provide a low cost, high performance miniature optical receiver module which integrates a high speed, high responsivity, low leakage current InGaAs photodiode with a GaAs transimpedance amplifier. The transimpedance amplifier incorporates automatic gain control providing high optical overload performance. The receiver package offers high reliability which satisfies Telcordia GR-468-CORE specifications. The pigtailed receivers are available with industry standard FC, LC, SC, and ST® connectors. Custom connectors are also available.

diode amplifier leakage miniature optical receiver module laser speed performance industry current control light integration responsive fast package specification connector


Elive 3.0 Stable

https://www.elivecd.org/download/stable/

Saved by uncleflo on November 29th, 2018.

Elive is a non-commercial, cost-free operating system made for the daily use; a much faster, friendlier, and feature-rich replacement of your high cost and ineffective default operating system.Turn that up to 15-year-old equipment into a high-performance machine with a dazzling interface. Entirely customizable to meet your needs while remaining lightweight and beautiful.Elive can be up and running in 2 minutes without the need to install it, choose the language and the desired options to get the maximum performance, or just let Elive auto-detect them for you.Because the user experience is our top priority, we provide a very intuitive experience where anybody can use it, by keeping the interface simple and not over-saturated with options, while providing many automated tools. Elive is based on Debian, so it inherits the stability and reliability that Debian is famous for. The customized Enlightenment desktop is ultra-fast and perfectly stable. You can count on Elive to work day after day without issues. Comes with a full suite of applications, whether for work or for pleasure. It offers everything from a complete office suite, tools, games, and multimedia. You can enjoy watching movies or making your own. Professional video editor, graphic design, media center, or even recover files from formatted disks. Make 3D animations, edit and manipulate audio, image files, and so much more. Elive is intended for everyone from new users to advanced ones, who will find incredibly useful tools hidden inside.

live operating system software hardware light experience management computer friendly replace commercial free avility equipment machine interface customize remain lightweight beautiful installation desire option performance detect usage saturation stable issue multimedia professional advanced tool useful virtual system administration test


How to Shoot an Interview | Job Shadow

https://www.youtube.com/watch?v=J7ENEuqXDwY

Saved by uncleflo on November 1st, 2018.

How to shoot an Interview, with lots of tips made by Parker Walbeck, from his tutorials on how to make films. He explains lots of technical details, sound, lighting, composition, image tone, interviewing tips, and equipment used.

interview film movie tip explanation technical detail light composition image tone equipment howto shoot youtube walkthrough information


Ellumiglow

https://www.ellumiglow.com/

Saved by uncleflo on September 17th, 2018.

Ellumiglow is dedicated to merging Safety with Cool combining futuristic lighting technologies years ahead of the competition. Ellumiglow.com started because we saw a void in a totally cool lighting technologies. From our background in electronics, web design, and robotics, our passion for lighting has evolved into many amazingly cool lighting projects! Ellumiglow started in 2010, in beautiful San Diego, California. In 2012, we saw a need for energy efficient lighting brought to the mass market, and the best way we saw doing so was moving the business to Portland, Oregon. Since the move, Ellumiglow has grown leaps and bounds ahead of the competition, making our own world class inverters, furthering every facet of Electroluminescent Technology and getting the technology to the masses by selling into retailers across the nation. Today, you can pick up our most popular selling items in your local area, through one of our popular retailers. We thank our customers tremendously for allowing us to thrive in projects we love and hope the future brings even more glow!

glow light led illuminate safety future futuristic tech technology product merchant project amazing robotic leap market efficient portable competition retailer sell item beautiful shibaru


Exasun: de producent van de beste en mooiste zonne-technologie voor uw toepassing.

http://exasun.com/

Saved by uncleflo on June 21st, 2018.

Na jaren van ontwikkeling, is EXASUN in 2015 met de revolutionaire combinatie van achterzijdecontact cellen in een glas-glas zonnepaneel gekomen. Een ontwikkeling waarbij kwaliteit centraal staat: Een hogere opbrengst (meer kWh), Een levensduur van minimaal 30 jaar, Betere esthetiek, Hiervoor ontving EXASUN in dat jaar de Solar Solutions Innovation Award. Superieure Exasun technologie voor al uw toepassingen. Bij EXASUN producten komen kwaliteit en prestatie samen. De unieke technologie combineert hoogwaardige cel-technologie met de beste module technologie. Door keuze van de meest duurzame materialen leveren onze producten een blijvend hoge output en een zeer lange levensduur. In al onze producten staan hiermee prestatie en kwaliteit voorop.

sun light cell glass sunpanel development power energy home innovation solution solar solarpanel superior technology product prestation quality netherlands world europe life revolutionairy esthetic combination


PHP Mini SQL Admin

https://sourceforge.net/projects/phpminiadmin/

Saved by uncleflo on February 15th, 2018.

PHP Mini SQL Admin - Lightweight alternative to heavy phpMyAdmin. Extremely small (~30Kb) standalone php script. Easy to Install, simple to use. No SQL knowledge required for basic operations. Features: full MySQL support, extremely small (~30Kb), just in one php file.

php tool mysql interface connect light lightweight alternative small simple operation feature database file easy useful db dbms frontent mini query sql


Best Bike Locks | Hi Trek Cycles

http://hitrekcycles.com/product/specialty-bike-locks-best/

Saved by uncleflo on September 4th, 2016.

Bicycle Lock, Light agile and very interesting! Product Description: Litelok, HTC Security Rating: 9/10, $120, Weight: 2.2 lbs, Length: 29″, 2 Velcro Straps or Zip Bag

bicycle lock innovation product description security rating light purchase best cycle special unique design good agile new desire wishlist


SVG Basics Tutorials - Scalable Vector Graphics by Hand

http://www.svgbasics.com/

Saved by uncleflo on June 13th, 2015.

Welcome to the SVGBasics tutorials. Scalable Vector Graphics (SVG) is a standard from the W3C which is built on top of XML. The SVG standard describes ways that graphics can be drawn for use on the web. I've assembled here some examples that you can freely modify and reuse. The idea is to cover the basics with numerous examples that people can experiment with to get an idea of what SVG can do. The Scalable Vector Graphics (SVG) recommendation comes from the W3C. The recommendation describes how to create vector graphics using a mark up language. Because SVG is based on XML, tools that already know how to interpret XML will be able to interpret SVG. Having this well-established standard as a foundation saves a lot of the work in defining the language. It also means that there are numerous tools around which can check the structure of an SVG document or read it to pull out interesting information.

svg graphics browser vector scale hand tutorial xml howto development step-by-step description structure document language tool information font curve line transformation shape basic text light image source


Scratchapixel

http://www.scratchapixel.com/index.php

Saved by uncleflo on February 22nd, 2015.

Everything You Ever Wanted to Know About Computer Graphics (But Were Afraid to Ask). You love Pixar movies and video games. You would love to learn how they are made and found some books on this topic at the library, but they are full of maths symbols you don't understand!

scratch pixel computer graphics pixar movies video games book topic library maths symbol howto opengl rendering implementation theory education learn online reference explanation light model animation realtime trick tip processing


graphics.stanford.edu/courses/cs148-10-summer/docs/2006--degreve--reflection_refraction.pdf

http://graphics.stanford.edu/courses/cs148-10-summer/docs/2006--degreve--reflection_refraction.pdf

Saved by uncleflo on February 22nd, 2015.

When writing a ray tracer, sooner or later you’ll stumble on the problem of reflection and transmission. To visualize mirror-like objects, you need to reflect your viewing rays. To simulate a lens, you need refraction. While most people have heard of the law of reflection and Snell’s law, they often have difficulties with actually calculating the direction vectors of the reflected and refracted rays. In the following pages, exactly this problem will be addressed. As a bonus, some Fresnel equations will be added to the mix, so you can actually calculate how much light is reflected or transmitted (yes, it’s possible). At the end, you’ll have some usable formulas to use in your latest ray tracer.

animation reference computer graphics ray tracer reflection refraction paper theory lens mirror transmission color light 3d plane normal implementation howto intersection math mathematics


Snell's law - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Snell%27s_law#Vector_form

Saved by uncleflo on February 22nd, 2015.

Snell's law (also known as the Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air. In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material. The law is also satisfied in metamaterials, which allow light to be bent "backward" at a negative angle of refraction with a negative refractive index.

wikipedia refraction light theory media angle material optic law difference mathematical math howto interface velocity index medium normal reference 3d game design