Multiple choice

Which of the following is NOT caused by the atmospheric refraction of light

  1. Twinkling of stars at night

  2. Sun apparently higher in sky than it usually is

  3. Sun appearing red at sunset

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Twinkling of stars and the apparent position of the sun are classic examples of atmospheric refraction. The red color of the sun at sunset is caused by the scattering of light, not refraction.

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