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JEE Main20199 Apr 2019Morning ShiftPhysicsRay OpticsActual

A concave mirror for face viewing has a focal length of 0.4 m . The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is

Options

  1. A1.60 m
  2. B0.16 m
  3. C0.32 m
  4. D0.24 m

Correct answer

C. 0.32 m

Step-by-step solution

m = 5 = - v u                 ⇒ v = - 5 u f = - 0 .4   m From mirror formula, 1 v + 1 u = 1 f 1 - 5 u + 1 u = 1 - 0 .4 - 1 + 5 5 u = 1 - 0 .4 u = 4 5 - 0 .4 = - 0 .32   m So, distance of object from mirror = 0.32   m

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