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Two identical equiconvex lenses made of ...

Two identical equiconvex lenses made of glass of reflected index 1.5 placed in contact has power `P`. When a liquid of refractive index `mu` is filled in the gap between the convex lenses, the power becomes of initial value `(P//3)`. The value of `mu` is`K/3`. Find the value of `K`

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