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Refraction comes into play only when the light travels from one medium into another medium. The speed of light is different in different media, so the wavelength changes due to refraction. The formula for wavelength is the ratio of the speed of light to its frequency. The most important point is that the frequency character of light remains constant eventhough it travels in different media. Hence the wavelength is directly proportional to the speed of light. So as speed changes, the wavelength also changes accordingly.

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14y ago
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6y ago

Whenever it goes from a medium with one refractive index to one with a different refractive index.

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Q: When is the speed of light increases or decreases after refraction?
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