NEET 2001 Physics question
A disc is placed on a surface of pond which has refractive index . A source of light is placed 4 m below the surface of liquid. The minimum radius of disc will be so light is not coming out
Answer: (2)
Solution
Light from the source reaches the surface at all angles of incidence. Rays striking the surface at angles beyond the critical angle undergo total internal reflection, so only the circle within
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