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A cavity of the shape of equiconvex len...

A cavity of the shape of equiconvex lens is cut in a large slab of refractive index `mu` .If it is filled with liquid of refractive indices `mu_(1)`inside the slab.This filled part behaves as convergent lens of focal length for the two media.If it is filled with another liquid of refractive indices `mu_(2)` it behaves as divergent lens of same focal length.Find `mu_(2)` .

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