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
Correct Answer: C. 13.3cm
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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