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The power of a thin convex lens (""(a) m...

The power of a thin convex lens `(""_(a) mu_(g)=1.5)` is `+5.0 D`. When it is placed in liquid of refractive index `""_(a) mu_(l)` then it behaves as a concavelens of focal length 100 cm. the refractive index of liquid `""_(a) mu_(i)` will be

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