Optics Question 344
Question: When the length of a microscope tube increases, its magnifying power
[MNR 1986]
Options:
A) Decreases
B) Increases
C) Does not change
D) May decrease or increase
Show Answer
Answer:
Correct Answer: A
Solution:
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, ue will increase and hence magnifying power (m) will decrease.
