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A ray of light passes from vacuum to a medium of refractive index n. The angle of incidence is found to be twice the angle of refraction. The angle of incidence is

(A) cos-1\(\left(\cfrac n2\right)\)

(B) cos-1 (n) 

(C) 2cos-1 \(\left(\cfrac n2\right)\)

(D) 2sin-1\(\left(\cfrac n2\right)\)

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(C) 2cos-1 \(\left(\cfrac n2\right)\)

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