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An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm . The focal length of objective is

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An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm . The focal length of objective is
A. `2 cm`
B. `200 cm`
C. `(1)/(2) cm`
D. `(1)/(200) cm`
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Correct Answer - b
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