properties of electromagnetic waves

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refraction of waves

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4 Terms

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what is refraction?

when a wave changes direction as it enters a different medium.

2
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refraction in a glass block

  • wave slows down and bends towards the normal due to entering a more dense medium.

  • wave speeds up and bends away from the normal due to entering a less dense medium.

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what is a wavefront?

a wavefront is a line showing all of the points on a wave that are in the same position as each other after a given number of wavelengths.

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refraction using wavefront diagram

  • when the first wavefront starts to move into the glass, those parts of the wavefronts slow down.

  • this causes those parts of the wavefronts to get closer together.

  • their wavelength gets smaller.

  • this causes the waves to change direction towards the normal.

  • the waves are refracting.