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In the adjoining figure, a wavefront AB ...

In the adjoining figure, a wavefront AB moving in air is incident on a plane glass surface XY. Its position CD, after refraction through a glass slab is shown also along with the normals drawn at A and D. The refractive index of glass with respect to air will be equal to

A

`(sin theta)/(sin theta')`

B

`(sin theta)/(sin phi')`

C

`(sin phi')/(sin theta)`

D

`(AB)/(CD)`

Text Solution

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The correct Answer is:
b
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