Multiple choice

In the focal length of the objective lens is increased then

  1. the magnifying power of microscope will increased but that of the telescope will decrease

  2. the magnifying power of the microscope and telescope will increase

  3. the magnifying power of the microscope and telescope will decrease

  4. the magnifying power of microscope will decrease but that of the telescope will increase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a microscope, magnifying power decreases when objective focal length increases because magnification is inversely proportional to focal length. For telescopes, magnifying power increases with objective focal length because telescope magnification equals objective focal length divided by eyepiece focal length.

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