Optics 3 Question 33

33. A convex lens of focal length 1m and a concave lens of focal length 0.25m are kept 0.75m apart. A parallel beam of light first passes through the convex lens, then through the concave lens and comes to a focus 0.5m away from the concave lens.

(1983,2M)

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Answer:

Correct Answer: 33. F

Solution:

  1. At I1, second focus of convex lens coincides with first focus of concave lens. Hence, rays will become parallel to the optic axis after refraction from both the lenses.

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