WBCS.LIVE practice question

What will be the focal length of a convex lens with the power of a +2.5 Diopter?

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

Answer options

  1. 20 cm
  2. 10 cm
  3. 40 cm
  4. 5 cm

Correct answer and explanation

Correct answer: 40 cm