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Question

Draw a labelled ray diagram of an image formed by a refracting telescope with final image formed at infinity. Derive an expression for its magnifying power with the final image at infinity.

Solution
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Ray diagram of the image formed at infinity by refracting telescope is shown here which indicates that focal length of objective lens and that of eye piece is fo and fe respectively.
Magnifying power of telescope is defined as the ratio of angle subtended by image on eye (β) to angle subtended by object on eye (α)
Magnifying power of telescope m=βα
From figure, β=tanβ=ABfe
Also, α=tanα=ABfo
βα=fofe
m=fofe
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