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

a
sin−1(213)
b
sin−1(213)
c
sin−1(213)
d
sin−1(313)

detailed solution

Correct option is C

If light is partly reflected and partly refracted, thenμ=tani⇒tani=32From snell’s lawsinr=siniμ⇒23×313∴r=sin−1[213]

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Glass has refractive index μ with respect to air and the critical angle for a ray of light going from glass to air is θ. If a ray of light is incident from air on the glass with angle of incidence θ, the corresponding angle of refraction is 


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