JAMB Physics 2014 Objective — Question 30

Question 30 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.

The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at

A. 2.0 m
B. 2.3 m
C. 2.5 m
D. 2.7 mCorrect

Explanation

Using 1/f=1/u+1/v: 1/2=1/8+1/v, 1/v=1/2−1/8=3/8, v=8/3≈2.7cm (the option is presented in cm, consistent with the source's note that the correct answer is 2.7cm).

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