When light is refracted into a medium, ______________ .

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its wavelength decreases but frequency remains unchanged Frequency of a light wave, as it travels from one medium to another, always remains unchanged, while wavelength decreases. Decrease in the wavelength of light entering a medium of refractive index \mu is given by \lambda_M = \lambda/\mu, 	ext{where }\lambda_M = 	ext{wavelength in medium} \lambda = 	ext{wavelength in vacuum} \mu = 	ext{refractive index}

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