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MHT CET20243 May 2024Evening ShiftPhysicsRay OpticsActual

A convex lens of focal length ' f ' produces a real image whose size is ' n ' times the size of an object. The distance of the object from the lens is

Options

  1. An +1 nf
  2. Bf (1- 1 n )
  3. Cnf n +1
  4. Df (1+ 1 n )

Correct answer

D. f (1+ 1 n )

Step-by-step solution

Given, Image distance, v=-n u aligned 1 f & = 1 v - 1 u = 1 - nu - 1 u = u + nu n u^2 1 f & = 1+ n nu u & = f ( 1+ n n )= f (1+ 1 n ) aligned

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