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Light waves are incident on an air-glass boundary. Some of the light waves are reflected and some are refracted in the glass.  Which one of the following properties is the same for the incident wave and the refracted wave?

Light waves are incident on an air-glass boundary. Some of the light waves are reflected and some are refracted in the glass.  Which one of the following properties is the same for the incident wave and the refracted wave? Correct Answer Frequency

CONCEPT:

  • Refraction of Light: The bending of the ray of light passing from one medium to the other medium is called refraction.

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  • The refraction of light takes place on going from one medium to another because the speed of light is different in the two media.
  • The greater the difference in the speeds of light in the two media, the greater will be the amount of refraction.
  • A medium in which the speed of light is more is known as an optically rarer medium and a medium in which the speed of light is less is known as an optically denser medium.

EXPLANATION:

  • Since the frequency of any light wave depends on the source frequency. Frequency doesn't depend on the medium.
  • So whenever the light goes from one medium to another or vice versa, the frequency of light and phase of light do not change. Therefore the option 4 is correct.
  • However, the velocity of light, the wavelength of light, and intensity depend on the medium, and hence the change.
  • Hence, when light waves are incident on an air-glass boundary, then the speed, direction, and brightness of the light wave changes. Therefore options 1, 2, and 3 are incorrect. 

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