WBCS.LIVE practice question

What is a zoom lens?

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

Answer options

  1. A lens with a definite focal length
  2. A lens with a transitional focal length
  3. It is used in Radio Telescopes.
  4. None of these

Correct answer and explanation

Correct answer: A lens with a transitional focal length