A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poure…

A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poured inside the bucket, then microscope has to be raised by \(30 \mathrm{~cm}\) to focus the object again. The height of the liquid in the bucket is:
[JEE Main 2023, 31 Jan (Shift 2)]