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

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

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 (1) cos⁡−1(n2)\cos^{-1}\left(\frac{n}{2}\right) (2) sin⁡−1(n2)\sin^{-1}\left(\frac{n}{2}\right) (3) 2cos⁡−1(n2)2\cos^{-1}\left(\frac{n}{2}\right) (4) 2sin⁡−1(n2)2\sin^{-1}\left(\frac{n}{2}\right)

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