Light and Optics Quiz
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Questions and Answers

Which one of these is the focal length of a lens with a 2D capacity?

  • 30 cm
  • 50 cm
  • 40 cm (correct)
  • 20 cm

    • If the focal length of an upright lens is 50 cm, what is its power?

  • +2D
  • -5D
  • -2D
  • +5D (correct)

    • What is the focal length of a lens with a power of -2D?

  • 40 cm
  • 30 cm (correct)
  • 20 cm
  • 50 cm

    • Which one of these is NOT a characteristic of light rays?

    <p>Absorption</p> Signup and view all the answers

    What is the unit of measurement for focal length?

    <p>Centimeters</p> Signup and view all the answers

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