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Telescope

Two lenses of...

Question

Two lenses of focal lengths $+ 100 c m$ and $+ 5 c m$ are used to prepare an astronomical telescope. The minimum tube length will be : (final image is at $\infty$ )

A

95 c m

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B

100 c m

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C

105 c m

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D

500 c m

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Solution

The correct option is C $105 c m$
the length of telescope =focal length of object $(- f_{0})$ +focal length of eyepiece $(f_{e})$ $= 100 + 5 = 105 c m$

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