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MPSC State Service 2018 · GS · Question 37 of 99

What focal length should the spectacles have for a person for whom the least distance of distinct vision is 50 cm?

Physics

  1. A50 cm, concave
  2. B50 cm, convexCorrect
  3. C25 cm, concave
  4. D25 cm, convex

Answer: B. 50 cm, convex

Explanation

For least distance of distinct vision 50 cm (instead of normal 25 cm), a convex lens of 50 cm focal length is needed.

Source: MPSC Rajyaseva Prelims 2018 GS Paper I (official paper)

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