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AIIMS2011PhysicsRay Optics

A far sighted person has his near point 50 ~cm , find the power of lens he should use to see at 25 ~cm , clearly.

Options

  1. A+1 D
  2. B+2 D
  3. C-2 D
  4. D-1 D

Correct answer

B. +2 D

Step-by-step solution

Here u=-25 ~cm , v=-50 ~cm We have 1 f = 1 -u + 1 v i.e, 1 f = 1 25 - 1 50 or f=50 ~cm Power of lens he should use, P= 100 f = 100 50 =+2 D

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