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This phenomenon occurs when light waves travel through media of different optical density.
a.dipersion b.reflection c.refraction d.diffraction​

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C.Refraction

Refraction is the change of direction in which light travels as it passes from one substance to another that has a different optical density (as from air into a gemstone). Optical density is a property that manifests itself in the slowing down of light, i.e. the higher the optical density, the lower the speed of light.11

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