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UPSC Physics Electric Current and Magnetism Question Bank Electricity, Magnetism and Light

  • question_answer
          When an optician prescribes a - 5D lens, what does it mean?                        [NDA]

    A) Concave lens of 20 cm focal length

    B) Convex lens of 5 cm focal length

    C) Concave lens of 5 cm focal length

    D) Convex lens of 5 cm focal length

    Correct Answer: A

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