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Question

The speed of light in glass slab is ________ compared to that in air. Fill in the gap.

A
more
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B
less
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C
the same
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D
can not be decided
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Solution

The correct option is A less

The refractive index of a medium is defined as n=cv, where c is the speed of light in the air and v is the speed of light in the medium.

The refractive index of the glass slab is n=1.5, which is greater than 1. Therefore, c>v or v<c.

Thus the speed of light in the glass slab is less as compared to the speed of light in the air.


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