Q:

The phenomenon of refraction is due to

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The phenomenon of refraction is due to


  1. light rays bending when they enter a different medium.
  2. the decrease in speed when a ray enters a less dense medium.
  3. the difference in refractive indices of two media.
  4. the different speeds with which different frequencies of light travel through media.

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C: In choice D, the different speeds with which different frequencies of light travel through media are due to the different refractive indices of the different frequencies. 

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