To obtain pure spectrum, the condition is that

Options :
  1. prism is in the position of minimum deviation
  2. rays of light incident on the prism are parallel to each other
  3. prism is in the position of minimum deviation and the white light rays incident on the prism are parallel to each other and the emergent rays are focused by a convex lens on a screen
  4. the light source is monochromatic
Answer and Explanation :-

Answer: Option 3

Explanation:

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