Total internal reflection occurs when a beam incident at an interface between tw

Question

Total internal reflection occurs when a beam incident at an interface between two materials is entirely reflected instead of passing through. Which must be true about the indices of refraction for the two materials if total internal reflection occurs? Consider the beam to be coming from material 1 and encountering the interface with material 2.

Select one:

a. The indices of refraction must be the same

b. The index of refraction of material 1 must be less than that of material 2

c. The index of refraction of material 1 must be greater than that of material 2

d. The index of refraction of material 2 must be greater than that of material 1

Explanation / Answer

The index of refraction of material 1 must be greater than that of material 2.

The phenomenon of total internal reflection occurs when ray goes from denser medium to rarer medium .

(n1 > n2 ).

Hence option (c) is correct.

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