Is it true that to recombine the spectrum to obtain white light, the dispersive prism and recombination prism should be in the same position?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
If we think of recombining, the dispersive prism and recombination prism should not be in the same position because the recombination of colours to form white light again is possible only if a second identical glass prism is placed in an inverted position beside the first prism. Then, it recombines the spectrum passed through the first prism, and a beam of white light is obtained on a screen behind the second prism.
The correct statement would be that to recombine the spectrum to obtain white light, the dispersive prism and recombination prism should be in the inverted position.

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