JAMB Physics 2009 Objective — Question 32

Question 32 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2009 Objective paper, with the correct answer and a full explanation.

32. An object of height 5cm is placed at 20cm from a concave mirror of focal length 10cm. The image height is

A. 3.0cm
B. 10cm
C. 15cm
D. 5cmCorrect

Explanation

1/f = 1/u + 1/v → 1/v = 1/10 - 1/20 = 1/20, so v = 20cm. Hi = Ho x v/u = 5 x 20/20 = 5cm.

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