Optics Question 395

Question: An opera glass (Gallilean telescope) measures 9 cm from the objective to the eyepiece. The focal length of the objective is 15 cm. Its magnifying power is

[DPMT 1988]

Options:

A) 2.5

B) 2/5

C) 5/3

D) 0.4

Show Answer

Answer:

Correct Answer: A

Solution:

fo−fe=9 cm and fe=fo−9=15−9=6 cm

⇒m=fofe=156=2.5

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