1.

When a convex lens of refactive index `3//2` and focal length `20 cm` is dropped into water of refracticve index `4//3`. Its focal length in water isA. `20`B. `40cm`C. `80cm`D. `10cm`

Answer» Correct Answer - C
`(f_(liq))/(f_(air))=((mu_(g)-1)mu_(l))/((mu_(g)-mu_(l))`


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