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\( A \) 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
[WB-JEE 2016]
(a) \( \sin \theta=\frac{1}{n_{2}} \)
(b) \( \sin \theta=\frac{1}{n_{1}} \)
(c) \( \sin \theta=\frac{n_{2}}{n_{1}} \)
(d) \( \sin \theta=\frac{n_{1}}{n_{2}} \)
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