Problem

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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