Answer to Question #53681 in Optics for y srinivasa rao

Question #53681

An equiconvex lens (of refractive index 1.5) is placed in contact with plane mirror as shown in the
figure. A small needle with its tip on the principal axis is moved along the axis until its inverted
image is found at the position of the needle. The distance of the needle from the lens is measured
to be 30 cm. Now a few drops of a liquid are put in between the lens and the plane mirror and the
new position of the image is located to be at 4.5 cm. Calculate the refractive index of the liquid.

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