Questions
A ray of light from a denser medium strike a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of with each other. The angles of reflection and refraction are r and . The critical angle is
detailed solution
Correct option is A
r + r' = 90o given μ sin i = (1) sin r' Snell's Law ⇒1sin c. sin i = sin (90o−r) ⇒1sin c. sin i =cos r ⇒sin c = tan i ⇒c = sin−1 (tan i)Talk to our academic expert!
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A point source of light is placed 4 m below the surface of water of refractive index . 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
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