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A beam of light AO is incident a glass s...

A beam of light AO is incident a glass slab `(mu=1.54)` in the direction show. The reflected ray OB is passed through a Nicol prism. On viewing through a Nicol prism, we find on rotating the prism that

A

the intensity is reduced to zero and remains zero

B

the intensity reduces down somewhat and rises again

C

there is no change in intensity

D

intensity gradually reduces to zero and then again increases

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The correct Answer is:
D
Intensity gradually increases and than decreases upto zero
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