On a horizontal plane mirror, a thin equi-convex lens of glass is placed and when the space between the lens and mirror is filled with a liquid. An object held at a distance D which is 30 cm vertically above the lens is found to coincide with its own image as shown in figure. If equi-convex lens of glass has refractive index and radius of curvature R=20 cm, then find refractive index of the liquid.
Description: Phys 2018-P1-Q -12.jpg
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Explanation:
If an object has to centroid with its image then the ray have to retrace its path hence it is conducted that object is at the focus of combination.
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