PhysicsLight: reflectionJAMB
An object is placed 15 cm from a concave mirror of focal length 10 cm. Find the image distance.
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Answer: A. 30 cm
1/v = 1/f − 1/u = 1/10 − 1/15 = 1/30, so v = 30 cm (real image).
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.