A real image of an object fom1ed by a converging lens of focal length 15cm...

WAEC 1992

A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?

A. 30cm
B. 25cm
C. 20cm
D. 15cm
E. 10cm

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Correct Answer: Option C

Explanation

1/u + 1/3u = 1/15; u = 20cm

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A real image of an object fom1ed by a converging lens of focal length 15cm...

Correct Answer: Option C

Explanation

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