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Q: Which of the following is NOT a example of refraction of light?
  • A. Formation of rainbow
  • B. Twinkling of stars
  • C. Image formation by human eye
  • D. Red colour of setting sun
Correct Answer: Option D - The colour of the sun becomes red while setting is not an example of refraction of light but of scattering of light. The reason for this is that at sunrise and sunset, the Sun ray has to travel a relatively greater distance through the atmosphere. In this way most of shorter wavelength light is separated by scattering, so only the red colour (the least scattering part of the light) reaches our eyes.
D. The colour of the sun becomes red while setting is not an example of refraction of light but of scattering of light. The reason for this is that at sunrise and sunset, the Sun ray has to travel a relatively greater distance through the atmosphere. In this way most of shorter wavelength light is separated by scattering, so only the red colour (the least scattering part of the light) reaches our eyes.

Explanations:

The colour of the sun becomes red while setting is not an example of refraction of light but of scattering of light. The reason for this is that at sunrise and sunset, the Sun ray has to travel a relatively greater distance through the atmosphere. In this way most of shorter wavelength light is separated by scattering, so only the red colour (the least scattering part of the light) reaches our eyes.