If the focal length of a camera lens is 20cm, the distance from the film...

JAMB 1993

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

A. 17cm
B. 20cm
C. 25cm
D. 100cm

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Correct Answer: Option C

Explanation

F = \(\frac{uv}{u + v}\)

20 = \(\frac{100 \times v}{100 + v}\)

v = 25cm

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If the focal length of a camera lens is 20cm, the distance from the film...

Correct Answer: Option C

Explanation

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