A transparent solid cylindrical rod has a refractive index of $\frac{2}{3}$ . It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. The incident angle $θ$ for which the light ray grazes along the wall of the rod is

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​ sin c = 2 3 ​ ​ sin r = sin ( 90 − c ) = cos c = 2 1 ​ sin r sin θ ​ = μ 1 ​ μ 2 ​ ​ sin θ = 3 ​ 2 ​ × 2 1 ​ θ = sin − 1 ( 3 ​ 1 ​ ) ​

Physics - Geometrical Optics Question with Solution | TestHub

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