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The focal lengths of the objective and t...

The focal lengths of the objective and the eyepiece of an astronomical telescope are 20 cm and 1 cm . If the instrument is focused for infinity and focused for distinct vision what will be the magnifying power ? What will be the length of the tube of the instrument in each case ?

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The correct Answer is:
m=20,L=21,m=20.8,L=20.96 cm
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