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A person has been using spectacles of power - 1 . 0 diopter for distant vision and a separate reading glass of power 2 . 0 diopters. What is the least distance of distinct vision for this person:

Options

  1. A  10   cm
  2. B40   cm
  3. C30   cm
  4. D50   cm

Correct answer

D. 50   cm

Step-by-step solution

Given, P = 2   D = 2   m - 1 Focal length is 1 f = 2 100   cm - 1 Using lens equation 1 v - 1 u = 1 f As we know, u = - 25   cm Then, 1 v - - 1 25 = 2 100 ⇒ 1 v = 1 50 - 1 25 ⇒ v = - 50   cm

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