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?
Violet will appear where red was
The spectrum will remain the same
There will be no spectrum, but only the original light with no deviation
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
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Solution
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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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