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MHT CET20227 Aug 2022Evening ShiftPhysicsRay OpticsActual

When final image is formed at D.D.V from eye, the magnifying power of microscope is ( f is the focal length of the lens)

Options

  1. A1+ f D
  2. B1+ D f
  3. CD f
  4. D1- D f

Correct answer

B. 1+ D f

Step-by-step solution

Consider the diagram below: Given, v=(-D) , Using mirror formula: 1 v - 1 u = 1 f aligned & 1 (-D) - 1 u = 1 f & 1 u =- ( f+D f D ) aligned Now, magnification can be easily calculated as: m= v u = (-D)(f+D) (-f D) = (1+ D f )

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