Visible light extends roughly from 400nm (violet) to 700nm (red). There is obviously some overlap but as a guide the colours fall into these regions:


In comparison to visible, the infra-red region is quite large and has the following regions. Note that 1µm is 1000 times longer than 1nm.

Microwaves and Radio Waves

Radio waves are typically from 10cm to 10km wavelength. Microwaves are much shorter, from 1mm to 1m wavelength. The microwave regions are:

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