A thin equiconvex lens of refractive index `3//2` is placed on a horizontal plane mirror as
Channel: Doubtnut
Date: 26/07/2020

A thin equiconvex lens of refractive index `3//2` is placed on a horizontal plane mirror as shown in figure. The space between the lens and the mirror is filled with a liquid of refractive index `4//3` . It is found that when a point object is placed 15 cm above the lens on its priincipal axis, the object coincides with its own image.  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V04_C01_E01_388_Q01.png" width="80%"  Q. If another liquid is filled instead of water, the object and the image coincide at a distance 25 cm from the lens.  Calculate the refractive index of the liquid.