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Q.

Is it true that if laser light is incident on the prism, we will be able to observe a band of seven colours?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
We will not observe a band of seven colours because laser light consists of monochromatic light of single colour. But seven colours of bands are only observed when white light is passed through a prism, which happens due to the dispersion phenomenon.
The correct statement would be that if laser light is incident on the prism, we won’t be able to observe a band of seven colours.
 
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