A converging lens has a focal length of 5cm. Determine its power

A converging lens has a focal length of 5cm. Determine its power
  • A.
    +20.0
  • B.
    +0.2
  • C.
    -20.00
  • D.
    -0.2
Correct Answer: Option A
Explanation

p = (frac{100}{f} = frac{100}{+5} = +20)

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