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Question

White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?
  1. Violet will appear where red was
  2. The spectrum will remain the same
  3. There will be no spectrum, but only the original light with no deviation
  4. There will be no spectrum, but the original light will be laterally displaced

A
There will be no spectrum, but only the original light with no deviation
B
The spectrum will remain the same
C
Violet will appear where red was
D
There will be no spectrum, but the original light will be laterally displaced
Solution
Verified by Toppr

Take two glass prisms P1 and P2 and place the second prism P2 upside down with respect to the first prism P1. Now, allow a beam of white light to fall on first prism P1. The first prism splits the white light into seven colors. When these colors fall on the inverted prism, it recombines all the colors into white light which is observed ultimately as a patch of white light on the screen.
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