Optics Question 434

Question: An astronomical telescope has objective and eye-piece lens of powers 0.5 D and 20 D respectively, its magnifying power will be

[Pb. PET 2002]

Options:

A) 8

B) 20

C) 30

D) 40

Show Answer

Answer:

Correct Answer: D

Solution:

$ M=\frac{f _{o}}{f _{e}}=\frac{P _{e}}{P _{o}}=\frac{20}{0.5}=40 $ .



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