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If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of the objective |
100 cm 10 cm 20 cm 25 cm |
100 cm |
$L=f_0+f_e=105cm$ and $M=\frac{f_0}{f_e}=20$ $⇒f_0=100cm$ and $f_e=5cm$ |
