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Physics problems example with solution - Optics - problem 8

A converging lens with focal length f = 30 cm and n = 1.5, is inserted into a transparent optical environment with n' = 1.6. Find out new lens focal length and interpret the result.


Solution

When lens is in the air:







When the lens is inserted into the new environment:


















Since f ' is negative, this means that the nature of the lens changes,  it becomes divergent.

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