When light is refracted from air into glass,

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(C) When light travels from one medium to another,its frequency $(f)$ remains constant because it depends on the source of the light.The speed of ligh

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Its wavelength decreases but frequency remains unchanged

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(C) When light travels from one medium to another,its frequency $(f)$ remains constant because it depends on the source of the light.The speed of light $(v)$ in a medium is given by $v = f \lambda$,where $\lambda$ is the wavelength.Since the refractive index of glass $(\mu_g)$ is greater than that of air $(\mu_a)$,the speed of light decreases when it enters the glass $(v_g Because $v = f \lambda$ and $f$ is constant,the decrease in speed $(v)$ must result in a decrease in wavelength $(\lambda)$.Therefore,the wavelength decreases while the frequency remains unchanged.

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