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An image in a convex lens is upright and magnified 3 times. If the focal...

Physics
JAMB 2011
An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?
  • A. 10 cm
  • B. 25 cm
  • C. 16 cm
  • D. 14 cm
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Correct Answer: Option A
Explanation
m = v/u = -3
v = -3u
f = 15cm
1/v + 1/U = 1/f
1/-3U + 1/u = 1/15
2/3u = 1/15
3U = 15 x 2
U = 30/3
= 10 cm

There is an explanation video available below.

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Explanation Video

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Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now