![]() ![]() We can begin to build up a picture of how frequency is related to colour.Ī frequent way of referring to colour on computer screens is by using the RGB system. The lasers in your Blu-ray player emit at 405nm, which as the name suggests, is blue. Helium-neon lasers emit at 632.8nm, which is a bright red. However, a laser for example, emits only at a single very specific frequency. Sunlight appears white to us because it emits almost uniformly over all visible frequencies. ![]() Higher frequency radiation, such as x-rays are absorbed by the atmosphere, as are lower frequencies, such as microwaves. The particular range of wavelengths coincides with a window in the Earth's atmosphere, through which this light can travel. Over the course of millions of years, the human eye has evolved to detect light in the range 380-780nm,Ī portion of the electromagnetic spectrum known as visible light, which we perceive as colour. ![]()
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