Question

Why Frequency Does Not Chang When Light Going One Medium To Another

Answer 1

every light ray have its own frequency due to which it differs from one another but the frequency of a specific light never changes while traveling from one medium to another but the thing changes is refractive index.

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Answer 2

The energy of the light is related to the frequency; when the light enters the medium there are interference patterns that cause the apparent speed of light to change; if the frequency changed, the energy would not be conserved. The wavelength changes to balance the change in speed.