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