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An object is placed 5 cm from the pole of a concave mirror. if the...

Physics
JAMB 2009

An object is placed 5 cm from the pole of a concave mirror. if the focal length of the mirror is 10 cm. what is the image distance?

  • A. 10 cm in front of the mirror.
  • B. 5 cm in front of the mirror
  • C. 10 cm behind the mirror
  • D. 5 cm behind the mirror
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Correct Answer: Option C
Explanation

u = 5 cm , f = 10 cm, v = ?
(1)/v + (1)/u = (1)/f
(1)/v + (1)/5 = (1)/10
= (1)/v = (1)/10 - (1)/5

= (1 - 2)/10 = (1)/10
∴ v = - 10 cm
∴ The image is 10 cm behind the mirror

There is an explanation video available below.


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Explanation Video

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JAMB CBT Software 2025 - Free Download
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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