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A converging lens produces an image four times as large as an object placed 25cm...

Physics
WAEC 2003
A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length
  • A. 100cm
  • B. 33cm
  • C. 29cm
  • D. 20cm
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Correct Answer: Option D
Explanation
M = \(\frac{v}{u}\)

v = mu = 4 x 25 = 100m

\(\frac{1}{v} + \frac{1}{u} = \frac{1}{f}\)

\(\frac{1}{100} + \frac{1}{25} = \frac{1}{f}\)

f = 20cm
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