Optics 3 Question 33
33. A convex lens of focal length $1 m$ and a concave lens of focal length $0.25 m$ are kept $0.75 m$ apart. A parallel beam of light first passes through the convex lens, then through the concave lens and comes to a focus $0.5 m$ away from the concave lens.
$(1983,2 M)$
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Answer:
Correct Answer: 33. F
Solution:
- At $I _1$, 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.
