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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

(1) 180°

(2) 0°

(3) Equal to angle of incidence

(4) 90°
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Ray optics and optical instruments

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Ans: (4) 90º

Sol: In TIR when angle of incidence is equal to critical angle,then angle of refraction is 90º.

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