A ray of light passes from vacuum into a medium of refractive index

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

A ray of light passes from vacuum into a medium of refractive index nn. If the angle of incidence is twice the angle of refraction, then the angle of incidence is: (a) cos⁡−1(n/2)\cos^{-1}(n/2) (b) sin⁡−1(n/2)\sin^{-1}(n/2) (c) 2cos⁡−1(n/2)2 \cos^{-1}(n/2) (d) 2sin⁡−1(n/2)2 \sin^{-1}(n/2)

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