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A converging lens of focal length 10cm forms an erect image three times the size...

Physics
WAEC 2017

A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.

  • A. 6.6cm
  • B. 11.1cm
  • C. 13.3cm
  • D. 20.0cm
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Correct Answer: Option C
Explanation

Given, image size = 3U

object size = U

focal length = 10cm

lens to object distance = \(\frac{focal length \times object size}{image size}\)

= \(\frac{10 \times u}{3u} = 3.33\)

distance between image and object = 10 + 3.33 = 13.33cm


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