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Q.

A monochromatic light wave is incident normally on a glass slab of thickness d, as shown in the figure. The refractive index of the slab increases linearly from  n1  to  n2  over the height h. Which of the following statement(s) is (are) true about the light wave emerging out of the slab ?
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a

It will not deflect.

b

The deflection angle depends only on  (n2n1)  and not on the individual values of  n1  and  n2.

c

It will deflect up by an angle  tan1[(n22n12)d2h]

d

It will deflect up by an angle  tan1[(n2n1)dh]

answer is B, D.

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