Although we traditionally identify a rainbow by seven component colors, it's actually a continuum with no discrete boundaries from one hue to the next. It was Newton who arbitrarily split the spectrum into seven colors in deference to the ancient Greeks, who believed seven to be a mystical number. The colors are, in order from longest wavelength to shortest, red, orange, yellow, green, blue, indigo and violet. If you're looking for a way to remember the order, use the acronym ROYGBIV, pronounced roy-gee-biv, or try this mnemonic: ROY Gave Betti Violets.

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Deziel, Chris. "What Happens To A White Light When It Passes Through A Prism And Why?" sciencing.com, https://www.sciencing.com/happens-light-passes-through-prism-8557530/. 30 April 2018.

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Refraction is a phenomenon that happens when a beam of white light passes through the interface between air and a denser medium, such as glass or water. Light travels more slowly in a denser medium, so it changes direction – or refracts – when it passes through the interface. White light is a mixture of all the wavelengths of light, and each wavelength refracts at a slightly different angle. Therefore, when the beam emerges from the denser medium, it has been split into its component wavelengths. The ones you can see form the familiar rainbow.

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The wavelength frequency increases as you proceed across the rainbow from red to violet. This means the energy of the individual photons – or wave packets – also increases, because the two are directly related by Planck's Law.

Shine a light through a prism, or hang one in the window on a sunny day, and you'll see a rainbow. It's the same rainbow you see in the sky because, on a day with a mixture of rain and sun, each raindrop acts as a miniature prism. For physicists debating whether light is a wave or particle, this phenomenon is a strong argument for the former. In fact, experiments with prisms were central to Issac Newton's formulation of the theory of optics and the wave nature of light.

Deziel, Chris. (2018, April 30). What Happens To A White Light When It Passes Through A Prism And Why?. sciencing.com. Retrieved from https://www.sciencing.com/happens-light-passes-through-prism-8557530/

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Many other materials besides glass produce rainbows. Diamond, ice, clear quartz and glycerine are just some examples. The breadth of the rainbow is a function of the index of refraction, which varies directly with the density of the material. You can even see a rainbow when light passes from water through a clear crystal or piece of glass and back into water.

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There are a lot of reasons why you want to use our UV LED technology. Money saving and Earth friendliness rank this technology a planet saver. Risk Reactor Inc.’s UV LEDs have a higher energy efficiency, longer lifetime, lower operating temperature than conventional UV lamps which create an intense amount of heat. Having the lower temperatures requires less energy for large exhaust fans and is environmental friendly. Risk Reactor Inc. UV LED curing units eliminates the need for ways to remove ozone. This helps you free up space and saving money on other equipment which also save on electricity costs. Our black lights made with our UV LED curing unit does not have a long warm up or a long cool down time. That alone is a huge safety factor. Frequent on and off cycling will not affect the lifetime of a UV LED curing unit unlike fluorescent tube type lighting. Risk Reactor Inc.'s UV LED curing units do not generate ozone and do not contain mercury or other harmful components like the HID and other older technology.

White light refracts when it passes through a prism. Each wavelength refracts at a different angle, and the emergent light forms a rainbow.

Our black light fluorescent lamps contain an amazing intense UV energy emitters. When the fluorescent material is activated by a dark (black) light it creates its photonic energy. Usually the black light energy fluctuates from 254 nano meters to 410 nano meters in the light spectrum. The common human eye can see light energy only between 400 to 700 nano meter (NM) wavelengths. It is within these wavelengths that we use to make items fluorescence or to cure UV glues and adhesives. Keep in mind the lower the NM number the more dangerous it is. 254 NM will burn and should be handled with care. We stick with 365 NM and 395 NM both of which are safer. With that being said, all LED lights should never be aimed at the eye. The stronger the LED source the more care and protective glasses should be worn.

Deziel, Chris. What Happens To A White Light When It Passes Through A Prism And Why? last modified March 24, 2022. https://www.sciencing.com/happens-light-passes-through-prism-8557530/

The angle of refraction in a particular medium is defined by its index of refraction, which is a property derived by dividing the speed of light in a vacuum by the speed of light in that particular medium. When light passes from one medium to another, the angle of refraction can be derived by dividing the indices of refraction of the two media. This relationship is known as Snell's Law, named for the 17th century physicist who discovered it.