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Question

Refraction of light doesn't happen when the incident light ray strikes_________ to the boundary of two medium.
  1. normal
  2. parallel
  3. opposite
  4. curved


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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