four identical thin lenses are kept one beside the other on the same o – InterviewSolution

1.	four identical thin lenses are kept one beside the other on the same optical axis . the right surface of rightmost lens is silvered . focal length of each lens is 20cm and radius of the silvered surface is 20cm. the focal length of combined system is ?
Answer» four identical thin lenses are kept one beside the other on the same optical axis . the right surface of rightmost lens is silvered . focal length of each lens is 20cm and radius of the silvered surface is 20cm. the focal length of combined system is ?

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