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When monochromatic red light is used instead of blue light in a convex lens, its focal length will :- Increase Decrease remain same doesn’t depend on color of light

When monochromatic red light is used instead of blue light in a convex lens, its focal length will :-
 
  1. Increase
  2. Decrease
  3. remain same
  4. doesn’t depend on color of light

Grade:11

1 Answers

Saurabh Kumar
askIITians Faculty 2400 Points
9 years ago
A convex lens is inverted like a inverted prism. The phase velocity is different for each colour. When the light comes out from the other side, the bending is more for red and less is for blue. Therefore, the focal length, which is due to bending changes more as compared with the blue light,

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