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Determine the focal length of a thin converging lens if the power is 5.0 dioptres

Physics
JAMB 2017
Determine the focal length of a thin converging lens if the power is 5.0 dioptres
  • A. 0.1 m
  • B. 0.2 m
  • C. 2.0 m
  • D. 2.5 m
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Correct Answer: Option B
Explanation
Power of a lens = \(\frac{1}{f}\)

f = focal length

f = \(\frac{1}{p}\)

= \(\frac{1}{5}\)

= 0.2m

There is an explanation video available below.

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Explanation Video

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