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Question
If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle I is not 0)?
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Solution
When a ray of light travels from medium I to medium II without any change of direction, it is possible under either of the following two conditions:
(i) A ray of light is incident normally on the surface separating two media.
(ii) The refractive index of the medium I is equal to the refractive index of medium II.
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