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Two identical equi-concave lenses made o...

Two identical equi-concave lenses made of magnitude of combined glass of refractive index 1.5, placed in contact has magnitude of combined power p. when a liquid of refractive index `mu` is filled in the gap between the concave lenses, the power becomes `+p/3`. the value of `mu` is `K/3`. find the value of K

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