Question

What is the wavelength of white light?

Answer 1

What we see as white light is in fact a mixture of light of different wavelengths.

Explanation:

We see light with wavelengths in the range `390`nm - `700`nm or so. Each specific wavelength corresponds to a pure colour ranging from violet to red.

White light is a mixture of colours.

One of my favourite puzzle questions is "Why does a combination of red light and green light make yellow light?"

It is not due to the combination of wavelengths somehow creating light of an intermediate wavelength.

The answer is that yellow light affects our eyes in a similar way to the way that a combination of red and green light does.

By the way, did you notice that rainbows don't include magenta. Magenta is always a combination of at least two different wavelengths of light.