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A biconvex thin lens is prepared from gl...

A biconvex thin lens is prepared from glass of refractive index `mu_(2)=(3)/(2)`. The two conducting surfaces have equal radii of 20 cm each. One of the the surface is silvered from outside to make it reflecting. It is placed in a medium of refractive index `mu_(1)=(5)/(3)`. It acts as a

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