Q. When the length of a microscope tube increases, its magnifying power
A) Decreases
B) Increases
C) Does not change
D) May decrease or increase
Explanation
(a) For a microscope $|m| = \frac{v_{o}}{u_{o}} \times \frac{D}{u_{e}}$ and $L = v_{o} + u_{e}$
For a given microscope, with increase in $L,\ u_{e}$ will increase and hence magnifying power $(m)$ will decrease
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.