Question

The magnifying power of a compound microscope is high if

• A. both eye-piece and objective have short focal lengths
• B. both objective and eye-piece have long focal lengths
• C. the objective has a long focal length and eye-piece has a short focal length
• D. the objective has a short focal length and eye-piece has a short focal length

Answer 1

The correct option is C the objective has a long focal length and eye-piece has a short focal length

$\text{Magnifying power =}\frac{\text{focal length of objective.}}{\text{focal length of eyepiece}}$

So magnifing power $\uparrow$ focal length of$\uparrow$ objective

magnifing power $\uparrow$ focal length of$\uparrow$ eye piece

So option c is correct.