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AIIMS2014PhysicsRay Optics

The near point of distinct vision is at 1 ~m for an elderly person. What power of lens is to be used to bring the near point to the minimum distance of distinct vision (25 ~cm ) ?

Options

  1. A2.5 D
  2. B3 D
  3. C3.5 D
  4. D4 D

Correct answer

B. 3 D

Step-by-step solution

Here, u=-25 ~cm v=-1 ~m =-100 ~cm 1 f = 1 v - 1 u = 1 -100 + 1 25 = 3 100 or f= 100 3 ~cm = 1 3 ~m Therefore, required power, P= 1 f( ~m ) = 1 1 / 3 P=3 D

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