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Question

A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging lens or a diverging lens? Give reason.

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Solution

In this case the biconvex lens will behave as a diverging lens because the refractive index of water (1.33) is more than that of the lens(1.25).

1f=(μr1){1R11R2}

1f=(μlμs1){1R11R2}

ifμl<μs,thentheresultofaboveformulawillbedominatedbynegative,

whichmeansfocusshiftsaboutthepoleofthelens,

whichmeansthenatureofthelenswill

bechangedfromconvergingtodiverging



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