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      Question

      What is the SI unit of power of a

      lens?
      A Watt Correct Answer Incorrect Answer
      B Lumen Correct Answer Incorrect Answer
      C Dioptre Correct Answer Incorrect Answer
      D Candela Correct Answer Incorrect Answer

      Solution

      Answer: Dioptre
      Explanation: ย  The power of a lens is the reciprocal of its focal length in meters. It is calculated using the formula ย  P = 1 / f.

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