When light enters from air to water,then its

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(B) When light travels from one medium to another,its frequency remains constant because it depends on the source of light.Since the refractive index

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Frequency is same but the wavelength is smaller in water than in air

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(B) When light travels from one medium to another,its frequency remains constant because it depends on the source of light.Since the refractive index of water $(n_w \approx 1.33)$ is greater than that of air $(n_a \approx 1.0)$,the speed of light decreases in water $(v = c/n)$.According to the relation $v = f \lambda$,since $v$ decreases and $f$ remains constant,the wavelength $\lambda$ must also decrease.Therefore,the frequency remains the same,but the wavelength is smaller in water than in air.

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