Question

The magnifying power of a simple microscope can be increased, if we use eye-piece of:

• A. Higher focal length
• B. Smaller diameter
• C. Smaller focal length
• D. Higher diameter

Answer 1

The correct option is C Smaller focal length

• We have the magnifying power formula as below:
  m=1+D/f

• From this we can observe that magnifying power is inversely proportional to the focal length

• Therefore, the smaller the focal length, the higher the magnifying power.

• Therefore the correct answer is B.