Optics Question 400

Question: Two convex lenses of focal lengths 0.3 m and 0.05 m are used to make a telescope. The distance kept between the two is

[MNR 1994]

Options:

A) 0.35 m

B) 0.25 m

C) 0.175 m

D) 0.15 m

Show Answer

Answer:

Correct Answer: A

Solution:

If final image is formed at infinity, then the distance between the two lenses of telescope is equal to length of tube $ =f _{o}+f _{e}=0.3+0.05=0.35\ m $



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