An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively....

WAEC 2016

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

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Correct Answer: Option A

Explanation

Magnify power = \(\frac{f_o}{f_e}\)

= \(\frac{3.5 \times 100}{5.0}\)

= 70

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An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively....

Correct Answer: Option A

Explanation

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