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A ray of light falls on a transparent glass slab of refractive index 1.73. If the reflected ray and the refracted ray are mutually perpendicular,

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A ray of light falls on a transparent glass slab of refractive index 1.73. If the reflected ray and the refracted ray are mutually perpendicular, the angle of incidence is 

(a) 30º 

(b) 48º 

(c) 60º 

(d) 75.2º

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 Correct option: (c) 60º

As, μ = tan θp

∴ Here

θp = θi = tan-1 1.73 = tan-1 \(\sqrt3\) = 60º

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