JAMB Physics 2010 Objective — Question 29

Question 29 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.

29. An object 4cm high is placed 15cm from a concave mirror of local length 5cm. The size of the image is A. 3cm B. 5cm C. 4cm D. 2cm

A. 3cm
B. 5cm
C. 4cm
D. 2cmCorrect

Explanation

H0=4cm, u=15cm, f=5cm. 1/f=1/u+1/v. 1/v=1/5-1/15=2/15. v=15/2=7.5cm. Magnification=v/u=Hi/H0. Hi=(vxH0)/u=(7.5x4)/15=2cm.

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