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The inner surface of the wall of a spher...

The inner surface of the wall of a sphere is perfectly reflecting. Radius of the sphere is R. A point source S is placed at a distance `R//2` from the centre of the sphere. Consider the reflection of light from the farthest wall followed by reflection from the nearest wall. Where is the image of the source? Consider paraxial rays only.

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The correct Answer is:
At a distance `(5R)/(6)` from the nearest wall
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