A ray of light entering from air to glass

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A ray of light entering from air to glass ( RI = 1.5 ) is partly reflected and partly refracted .If incident and the reflected rays are at right angle to each other , then angle of refraction is

Answered by admin @


Since the reflected ray and incident ray are at right angles, 2 (angle of reflection)= 90⁰ ⇒ the angle of incidence = 45⁰
 Applying Snell's law,
1 x sin (45⁰) = 1.5 x sin (θ)                    (θ = angle of refraction)
1/√2 = 3/2 x sin (θ)
θ = 28.125⁰

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