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Q.

An incident ray makes a $4 0^{o}$ angle with a normal air-glass interface of the rectangular glass slab. The angle of emergence will be

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a

5 5^{o}

b

6 0^{o}

c

4 0^{o}

d

6 5^{o}

answer is C.

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Detailed Solution

The angle of emergence will be

4 0^{o}

.
For a rectangular glass slab, the angle of incidence (i) is always equal to the angle of emergence.
Question Image

Question Image

Hence, the angle of emergence is 40o.

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An incident ray makes a 40o angle with a normal air-glass interface of the rectangular glass slab. The angle of emergence will be