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  4. 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

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Q. 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

Ray Optics and Optical Instruments

Solution:

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