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Q.

Is it true that colours of the spectrum can recombine to give a white light?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
Recombination of spectrum colours means combining seven colours of white light produced by a prism to give back the white light, which can be done by using a second prism placed in an inverted position behind the first prism. Two prisms must be identical to each other and kept in an inverted position with respect to each other. As a result, a white light emerging from the other side of the second prism can be seen.
 
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