Q. When light enters from air to water, then its

A
frequency increases and speed decreases
B
frequency is same but the wavelength is smaller in water than in air
C
frequency is same but the wavelength is larger in water than in air
D
frequency and speed both decreases
Solution:

The energy of the light is related to the frequency; when the light enters the medium there are interference patterns that cause the apparent speed of light to change; if the frequency changed, the energy would not be conserved. The wavelength changes to balance the change in speed.

As light moves from air into water, it not only slows but the wavelength changes.

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