PhysicsLight: reflectionWAEC
An object is 30 cm from a concave mirror of focal length 10 cm. Find the image distance.
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Answer: B. 15 cm
1/v = 1/f − 1/u = 1/10 − 1/30 = 2/30, so v = 15 cm.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.