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QAIPM-2001-Ph-2924: NEET 2001 Physics - Class 12 AIPM-2001-Ph-2924 Solution: A disc is placed on a surface of pond which has refractive…
A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is,
Multiple Choice Options
- A
- B 3 m
- C 6 m
- D 4 m
Step-by-Step Verified Solution
_ = sin _ 1 ( 1 _ ) = sin _ 1 ( 3 5 )
_ sin _ _ = 3 5
_ tan _ = 3 4 = r 4
_ r = 3 m