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A ray incident on face AB of a prism comes out of AC at grazing angle. Angle A is 90° & μ = 2.

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A ray incident on face AB of a prism comes out of AC at grazing angle. Angle A is 90° & μ = 2. The incidence angle is approximately

(a) 10 deg

(b) π/9  rad

(c) π/18 rad

(d)  4.5 deg

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Correct option  (b)  π/9 rad

Explanation:

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