Question

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

• A. higher focal length
• B. smaller focal length
• C. higher diameter
• D. smaller diameter

Answer 1

The correct option is B smaller focal length

for a simple microscope, magnifying power is given by
$M=1+\frac{D}{f_e}$
If $f_e$ is small, then $M$ is large.