Categories > Ray Optics and Optical Instruments > Total Internal Reflection > A point source of light is placed 4 m below the surface of water of refractive index 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 is

Ray Optics and Optical Instruments

Question: A point source of light is placed 4 m below the surface of water of refractive index 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 is


1) 2 m
2) 6 m
3) 4 m
4) 3 m
Solution: Explanation: No Explanation
Total Internal Reflection

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