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A and B are two parallel sided transpare...

A and B are two parallel sided transparent slabs of refractive indices `n_1 and n_2` respectively. A ray is incident at an angle `theta` on the surface of separation of A and B and after refraction from B into air grazes the surface of B. Then
`sin theta =1/(n_2)`
`sin theta=1/n_1`
`sin theta =n_2/n_1`
`sin theta =n_1/n_2`

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