Physics Circle home Student Login

Home›Chapters›Ray Optics PYQs›Optical Instruments & the Eye›Question 39

NEET 2016 (Phase 2) · Optical Instruments & the Eye

Optical Instruments & the Eye question from NEET 2016 (Phase 2)

Q39NEET 2016 · PHASE 2Medium

Optical Instruments & the Eye

A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

Show answer and solution

Answer: (b)

  1. Far point is 400 cm, so the person is myopic: use a concave lens.
  2. Lens must form an image of an object at infinity at the far point: f=−400f = -400 cm =−4= -4 m.
  3. P=1f=−14=−0.25P = \dfrac{1}{f} = -\dfrac{1}{4} = -0.25 D.
  4. So the answer is (b) concave, −0.25-0.25 D.
Report a mistake

More questions on Optical Instruments & the Eye