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The focal lenghts of the objective and t...

The focal lenghts of the objective and the eyepiece of a terrestrial telescope are 180 cm and 5 cm respectively. The focal length of the erecting lens is 3.5 cm. what is the distance between the objective and the eyepiece ? what is its magnifying power ? Can it be used for the purpose of astronomy ?

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199 cm ,36 ,yes
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