Ray Optics and Optical Instruments Quiz
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Questions and Answers

Which objects are considered luminous?

  • Sun and other stars (correct)
  • Flashlight and candles
  • Light bulbs and LED lights
  • Moon and planets

    • What is the speed of light in vacuum?

  • 4 x 10^8 m/s
  • 2 x 10^8 m/s
  • 3 x 10^8 m/s (correct)
  • 5 x 10^8 m/s

    • What is a real image?

  • Virtual and cannot be projected
  • Formed by reflection only
  • Formed by the actual meeting of light rays (correct)
  • Always smaller than the object

    • What happens to the speed and wavelength of light when it travels from one medium to another?

    <p>Speed and wavelength change</p> Signup and view all the answers

    What are non-luminous objects?

    <p>Objects that do not emit their own light</p> Signup and view all the answers

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