Question

From incident white light how will you obtain white emergent light by making use of two prisms?

Answer 1

1. Place a prism in the path of a beam of white light.
2. The prism splits the white light into its constituent colours, forming a spectrum.
3. Take another identical prism and position it parallel to the first, but inverted (upside down).
4. Let the spectrum produced by the first prism pass through the second prism.
5. The second prism recombines the colours, and a beam of white light emerges from the other side.

White light is the type of light that flows from the second prism's opposite side.

Explanation: There are seven colours that make up white light. White light is scattered by the first prism, and white light is once more produced by the second prism by combining light of various colours. A light beam has a net deviation of zero.