Question
What happens to the wavelength of light when it passes
from a medium of higher refractive index to a medium of lower refractive index? ÂSolution
When light passes from a medium with a higher refractive index to one with a lower refractive index, its speed increases, and thus its wavelength also increases.  This is a consequence of the relationship between speed, frequency, and wavelength.  The frequency of light remains constant, but the wavelength changes when the light enters a different medium.
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