Question

A thin equiconvex lens of glass of refractive index 1.5 whose surfaces have a radius of
curvature of 24cm is placed on a horizontal plane mirror. When the space between the lens and mirror is
filled with a liquid, a pin held 40 cm vertically above the lens is found to coineide with its own image.
Calculate the refractive index of the liquid.
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Answer 1

Answer:

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