PhysicsOptical instrumentsJAMB
An object is placed 60 cm from a converging lens of focal length 20 cm. Find the image distance.
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Answer: C. 30 cm
1/v = 1/20 − 1/60 = 2/60, so v = 30 cm.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.