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Telescopes

A small labor...

Question

A small laboratory telescope has an objective lens of focal, length $140 c m$ and an eye-piece of focal length $6 c m$ . Then, separation between the objective and eye-piece is :

A

140 c m

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B

24 c m

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C

156 c m

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D

146 c m

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Solution

The correct option is C $146 c m$
Separation between objective and eye-piece is
$L = f_{0} + f_{e}$
$∴ L = 140 + 6 = 146 c m$

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