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CBSE Class 10 Science Question 3 of 31

Light - Reflection and Refraction — Question 3

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Question

Question 3

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

  1. At the principal focus of the lens
  2. At twice the focal length
  3. At infinity
  4. Between the optical centre of the lens and its principal focus.
Answer

At twice the focal length

Reason — In order to get a real image of the same size as the object with the help of a convex lens, the object should be placed at twice the focal length.