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Inside a solid glass sphere of radius \( R \), a point source of light is embedded at a distance \( x(xR) \) from centre of the sphere. The solid sphere is surrounded by air of refractive index 1.0. The maximum angle of incidence for rays incident on the spherical glass-air interface directly from the point source is :
(A) \( \cos ^{-1} \frac{x}{R} \)
(B) \( \sin ^{-1} \frac{x}{R} \)
(C) \( \cos ^{-1} \sqrt{\frac{x}{R}} \)
(D) \( \sin ^{-1} \sqrt{\frac{x}{R}} \)
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