PhysicsOptical instrumentsWAEC
An object is placed 20 cm from a converging lens of focal length 10 cm. The image is formed at a distance of
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Answer: A. 20 cm
1/v = 1/f − 1/u = 1/10 − 1/20 = 1/20, so v = 20 cm.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.