Question

from incident white light how will you obtain white emergent light by making use of two prisms​

Answer 1

To get the light the original colour we place the two prisms inverted since one prism ... Have you ever googled yourself? ... What will happen when red light passed through a prism?

Answer 2

this experiment was found by Isaac Newton.

▪first he placed an prism and passed a white light.

▪the white light was split into 7 constituent colours.

▪again he placed an inverted prism, where the seven colours where coming into it.

▪again he got the white light

■ inverted prism is a way to obtain again white light from seven constituent colours.