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For a person near point of vision is 100 ~cm . Then the power of lens he must wear so as to have normal vision, should be

Options

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

Correct answer

C. +3 D

Step-by-step solution

The power of lens P= 1 f = 1 v - 1 u = [ 1 25 - 1 N.P. ] where N.P. = Near point of vision aligned & P= [ 1 25 - 1 100 ] & P= 4-1 100 = 3 100 ~cm = 3 1 ~m =3 D aligned

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