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A lens of focal length 15cm forms an erect image which is three times the...

Physics
JAMB 2018

A lens of focal length 15cm forms an erect image which is three times the size of the object. The distance between the object and the image is ___.

  • A. 10cm
  • B. 20cm
  • C. 30cm
  • D. 40cm
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Correct Answer: Option D
Explanation

F= 15cm

  M = 3

  M = \(\frac{v}{u}\)

  V =3u

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

  \(\frac{1}{15}\) = \(\frac{1}{u}\) - \(\frac{1}{3u}\)

  \(\frac{1}{15}\) =   \(\frac{2}{3u}\)

U =10cm

  D = u + v

  = 10 +30 = 40cm

There is an explanation video available below.


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Explanation Video

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