An object O is stuck on the surface of a transparent solid sphere of radius 20 cm. Find refractive index of the sphere such that rays from the object after refraction from the opposite side emerge as a parallel beam, as shown. Also prove that refractive index has the same value, in the given situation, for any value of radius of sphere.

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An object O is stuck on the surface of a transparent solid sphere of radius 20 cm. Find refractive index of the sphere such that rays from the object after refraction from the opposite side emerge as a parallel beam, as shown. Also prove that refractive index has the same value, in the given situation, for any value of radius of sphere.

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answer is B.

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