Question

Light rays bend as they pass from air into water at an angle (not 90 degrees). this is refraction. air water normal incident ray refracted ray which quantity doesn't change when light refracts?

Answer 1

The diagram shows that as a wave travels into a denser medium, such as water, it slows down and the wavelength decreases. Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes.I hope this helps you out have a good day and stay safe:)

Answer 2

When light ray pass from air into water, its speed and wavelength change only the frequency of the light doesn't change.

Light travels slower in a medium of higher refractive index. It bends because of this change in speed. The wavelength of light also changes in order to maintain the constant frequency.