Heat-induced Optical Distortions
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Questions and Answers

Which of the following best explains the apparent random wavering or flickering of objects seen through a turbulent stream of hot air?

  • The hot air is less dense than the cooler air
  • The hot air has a higher refractive index than the cooler air
  • The hot air has a lower refractive index than the cooler air (correct)
  • The hot air is denser than the cooler air

    • Which of the following correctly describes the physical conditions of the refracting medium (air) in this scenario?

  • The air is denser near the fire
  • The air is stationary and consistent
  • The air is cooler near the fire
  • The air is turbulent and inconsistent (correct)

    • What is the main cause of the apparent position of the object fluctuating when seen through the hot air?

  • The density of the hot air
  • The density of the cooler air
  • The refractive index of the cooler air
  • The refractive index of the hot air (correct)

    • What is the similarity between the wavering of objects seen through a turbulent stream of hot air and the twinkling of stars?

    <p>Both are caused by atmospheric refraction</p> Signup and view all the answers

    Why does the hotter air above the fire become lighter (less dense) than the cooler air above it?

    <p>The hot air has a lower refractive index</p> Signup and view all the answers

    Which of the following best explains the cause of the twinkling of stars?

    <p>The starlight is refracted continuously in the earth's atmosphere</p> Signup and view all the answers

    What is the effect of atmospheric refraction on the apparent position of a star?

    <p>The star appears higher than its actual position</p> Signup and view all the answers

    Why does the apparent position of a star fluctuate slightly?

    <p>The physical conditions of the earth's atmosphere are not stationary</p> Signup and view all the answers

    What is the main cause of the flickering of starlight entering the eye?

    <p>The physical conditions of the earth's atmosphere are not stationary</p> Signup and view all the answers

    Why do stars appear as point-sized sources of light?

    <p>Stars are very distant</p> Signup and view all the answers

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