Final answer:
When light travels from air into water, the wavelength decreases and the speed decreases, while the frequency remains the same.
Step-by-step explanation:
When light travels from air into water, the wavelength decreases and the speed decreases. The frequency of the light, however, remains the same. This phenomenon is known as refraction, which happens due to the change in speed of light in different media.
When light travels from air into water, the key aspect to understand is the relationship between the speed, wavelength, and frequency of light. The speed of light decreases when it moves from a less dense medium like air to a denser medium like water.
However, the frequency of the light does not change. Since the speed of light (v) is the product of its frequency (f) and wavelength (λ), written as v = f λ, a decrease in speed within the medium must lead to a decrease in the wavelength if the frequency is constant.
Therefore, the correct statement is that when light enters from air to water, the frequency remains the same, but the speed decreases and the wavelength is smaller in water than in air. This follows Snell's law of refraction, which describes the bending of light as it passes between different media with differing refractive indices.
Therefore answer is (B) is same but the wavelength is smaller in water than in air.