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Reflecting Telescope

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Question

As astronomical telescope has on objective and an eyepiece of focal lengths 10 cm and 1 cm respectively. Find its magnifying power and tube length in normal adjustment.

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Solution

Magnification ratio, $m = \frac{f o c a l l e n g t h o f o b j e c t i v e}{f o c a l l e n g t h o f e y e p i e c e}$

$m = \frac{10}{1} = 10$

Tube length = $f o c a l l e n g t h o f o b j e c t i v e + f o c a l l e n g t h o f e y e p i e c e$

$L = 10 + 1 = 11 c m$

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