At the angle of minimum deviation

Options :
  1. light ray is parallel to base of prism
  2. ray emerges normal to the prism
  3. angle between incident ray and emergent ray is 90 degree
  4. emergent ray is along the surface of the prism
Answer and Explanation :-

Answer: Option 1


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You see, we cannot draw lines and compartments and refuse to budge beyond them. Sometimes you have to use your failures as stepping-stones to success. You have to maintain a fine balance between hope and despair.' He paused, considering what he had just said. 'Yes', he repeated. 'In the end, it's all a question of balance.
-Rohinton Mistry A Fine Balance