Question

A light ray moving in medium - I (of refractive index ) is incident on interface of two media and it is totally internally reflected at the interface. Now, refractive index of medium - II is decreased, then:

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A

ray will move completely parallel to the interface

B

ray will be still totally internally reflected at interface

C

ray will be totally transmitted into medium-II only if angle of incidence is increased

D

ray will be totally transmitted in medium-II

Hard
Solution
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Correct option is B)

As decreases, also decreases.
So, condition is still satisfied and there will be still total internal reflection at interface. If angle of incidence is increases, then ray will be still totally internally reflected at interface because .

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