An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustment?

A. 70.0
B. 17.5
C. 7.0
D. 0.7

Correct Answer: Option A

A. 70.0

Explanation

Magnify power = fo/fe

= 3.5×1005.0

= 70

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