Optics Question 422

Question: In a laboratory four convex lenses $ L _{1},L _{2},L _{3} $ and $ L _{4} $ of focal lengths 2, 4, 6 and 8 cm respectively are available. Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are

[MP PMT 2001]

Options:

A) $ L _{2},L _{3} $

B) $ L _{1},L _{4} $

C) $ L _{3},L _{2} $

D) $ L _{4},L _{1} $

Show Answer

Answer:

Correct Answer: D

Solution:

To make telescope of higher magnifying power, $ f _{o} $ should be large and $ f _{e} $ should be least.



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