WBCS.LIVE practice question

Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25 cm from the optical centre?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 1 dioptre
  2. 9 dioptre
  3. 1 dioptre
  4. -9 dioptre

Correct answer and explanation

Correct answer: 9 dioptre