A very expensive diamond is polished into a perfect sphere of radius 5 cm. The back surface of the sphere is then covered with silver. If d is the distance of source of light from surface of sphere so that image coincide with the source. The index of refraction of diamond is 2.4, then d = …. × 5 cm.
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Ans. 5
Sol. Considering refraction at curved surface
+ 
= 
x = 25 cm
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