A point source of light is placed 4 m below the surface of water of $μ = \frac{5}{3}$ . The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off all light coming out of water (in m), is:
Options:
Answer:
A
Solution:

Question

A point source of light is placed 4 m below the surface of water of $μ = \frac{5}{3}$ . The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off all light coming out of water (in m), is:

Options:

Answer:

A

Solution:

Physics - Geometrical Optics Question with Solution | TestHub

Options:

Doubts & Discussion

JEE Main (2026)