Question

. How could you show that the colours of the spectrum combine to give white light​

Answer 1

Answer:

Colours of a spectrum from one prism are allowed to fall on a similar prism placed adjacent to the first prism, but in inverted position. The refraction produced by second prism is equal and opposite to that produced by the first prism. This makes the colours of the spectrum combine to give white light.

Answer 2

Answer:

Rotate a disk having all the seven colours of the spectrum at a very high speed and you will see only white colour.

THIS PROVES THAT COLOURS OF SPECTRUM COMBINE TO GIVE WHITE LIGHT