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A, B and C are the parallel sided transp...

A, B and C are the parallel sided transparent media of refractive index `n_1 n_2` and `n_3` respectively. They are arranged as shown in the figure
. A ray is incident at an angle `theta` on the surface of separation of A and B which is as shown in the figure. After the refraction into the medium B, the ray grazes the surface of separation of the media B and C. Then, `Sin theta =....................`

A

`n_1/n_2`

B

`n_2/n_3`

C

`n_1/n_3`

D

`n_3/n_1`.

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