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A narrow pencil of parallel light is incident normally on a- solid transparent sphere of radius r.

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asked Mar 30, 2018 in Physics by Nisa (2,540 points) ● 1 ● 3

A narrow pencil of parallel light is incident normally on a- solid transparent sphere of radius r. What should be the refractive index if the pencil is to he focused (a) at the surface of the sphere, (b) at the centre of the sphere.

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answered Mar 30, 2018 by rubby (7,550 points) ● 1 ● 3 ● 5
selected Apr 1, 2018 by Vikash Kumar
 
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For the refraction at convex surface A.

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