A plano-convex lens is made of a material of refractive index

A plano-convex lens is made of a material of refractive index When a small object is placed 30 cm away in front of the curved surface of the lens, an image of double the size of the object is produced. Due to reflection from the convex surface of the lens, another faint image is observed at a distance of 10 cm away from the lens. Which of the following statement(s) is(are) true?

  1. The refractive index of the lens is 5
  2. The radius of curvature of the convex surface is 45 cm
  3. The faint image is erect and real
  4. The focal length of the lens is 20
Anurag Mishra Professor Asked on 23rd May 2016 in Physics.
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  • 1 Answer(s)

    Answer: (1) The refractive index of the lens is 2.5 &  (4) The focal length of the lens is 20 cm.

    Anurag Mishra Professor Answered on 24th May 2016.
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