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Q.

A glass prism can indeed produce a spectrum when white light passes through it, but a glass slab does not.


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
It is so because both the refracting surfaces of a glass slab are parallel, and the dispersion caused by the first refraction of the surface gets cancelled by the refraction of the dispersed light through the second surface. Hence, the surfaces of the prism are inclined, which does not cancel the dispersion caused by the surfaces and produces the spectrum as a result.
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