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NEET 2010 Physics question

PhysicsRay Optics and Optical InstrumentsNEET 2010

A ray of light travelling in a transparent medium of refractive index , falls on a surface separating the medium from air at an angle of incidence of . For which of the following value of the ray can undergo total internal reflection?

Answer: (3)

Solution

Total internal reflection occurs when the angle of incidence exceeds the critical angle: , i.e. . With : \dfrac{1}{\sin 45°}\sqrt$2

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Question ID VK-090463