Optics 3 Question 31

31. A convex lens A of focal length 20cm and a concave lens B of focal length 5cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A leaves B as parallel beam, then d is equal to …….. cm.

(1985, 2M)

Show Answer

Answer:

Correct Answer: 31. 15

Solution:

  1. At I1, second focus of convex lens should coincide the first focus of concave lens.

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