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# A ray of light travelling in a transparent medium of refractive index falls on a surface separating the medium from the air at an angle of incidence of 45. For which of the following values of the ray can undergo total internal reflection?1.51.411.331.75

A
1.5
B
1.41
C
1.75
D
1.33
Solution
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#### We know, the refractive index of air is 1, Let the refractive index of medium be ηThe angle of incidence is given as 450 For total internal reflection, the angle of refraction must be 900For total internal reflection, η×sin45≥1×sin90⇒n≥√2⇒n≥1.414So the possible value of η is 1.5,Therefore the correct option is B.

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