Refraction of light doesn't happen when the incident light ray strikes_________ to the boundary of two medium.

normal

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parallel

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opposite

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curved

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Solution

The correct option is A normal
Light always tries to travel along the path of shortest time. When a light ray is approaching perpendicular to the medium, it is already following the path of shortest time, and thus refraction can't take place.

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No refraction occurs when the light ray incident is ___ a boundary of two medium.

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