A light ray moving in medium-I (of refra...

A light ray moving in medium-I (of refractive index `n_(1)`) is incident on interface of two media and it is totally internally reflected at the interface. Now, refractive index `n_(2)` of medium-II is decreased, then

ray will move completely parallel to the interface

ray will be still totally internally reflected at interface

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

ray will be totally transmitted in medium-II

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