A real image of an object fom1ed by a converging lens of focal length 15cm...
PHYSICS
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
Correct Answer: C. 20cm
Explanation
1/u + 1/3u = 1/15; u = 20cm
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