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JEE Advanced2006PhysicsRay OpticsActual

A point object is placed at distance of 20 ~cm from a thin planoconvex lens of focal length 15 ~cm . The plane surface of the lens is now silvered. The image created by the system is at

Options

  1. A60 ~cm to the left of the system
  2. B60 ~cm to the right of the system
  3. C12 ~cm to the left of the system
  4. D12 ~cm to the right of the system

Correct answer

C. 12 ~cm to the left of the system

Step-by-step solution

Refraction from lens aligned 1 v₁ - 1 -20 & = 1 15 v & =60 ~cm aligned i.e., first image is formed at 60 ~cm to the right of lens system. Reflection from mirror After reflection from the mirror, the second image will be formed at a distance of 60 ~cm to the left of lens system. Refraction from lens aligned 1 v₃ - 1 60 & = 1 15 v₃ & =12 ~cm aligned

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