Which of the folowing statements about light travelling from one material medium to another is not correct?

  • A The refracted angle is less than the incident angle if the speed is higher in the first material
  • B Its wavelength does not change
  • C It bends away from the normal if the speed is lower in the first material
  • D Its frequency changes.
waec 2022physics

The correct answer is D. Its frequency changes.

Refraction occurs when light travels from one medium to another which changes the speed at which the light travels.

This causes light to bend upon incidence with the interface of a new material.

 Angle of refraction is smaller than angle of incidence when light ray travels from rarer medium to denser medium.

I.e  light can either refract towards the normal(when slowing down while crossing the boundary) or away from the normal (when speeding up while crossing the boundary).

When light undergoes refraction, its frequency remains the same.

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