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A narror parallel beam of light is incid...

A narror parallel beam of light is incident paraxially on a solid transparent sphere of radius `r` kept in air. What should be the refreative index if the beam is to be focusd (a) at the further surface of the sphere, (b) at the centre of the sphere.

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The correct Answer is:
(a) `2`, (b) not possible, it will focus close to the centre if the refractive index is large.
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RESONANCE-GEOMATRICAL OPTICS -Exercise-1
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  10. An object of height 1cm is set at angles to the optical axis of a dou...

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  11. A lens placed between a candle and a fixed screen forms a real tr...

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  12. A pin of length 1cm lies along the principle axis of a converging len...

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  16. A convex lens and a convex mirror are placed at a separation fo 15cm...

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