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.



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