First slide

The optical instruments

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

Moderate

A

0.35 m
B

0.25 m
C

0.175 m
D

0.15 m

Solution

If final image is formed at infinity, then the distance between the two lenses of telescope is equal to length of tube = $= f_{0} + f_{e} = 0 .3 + 0 .05 = 0 .35 m$

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