Answer:
A change in direction and wavelength
Explanation:
This phenomenon is called refraction: this occurs when a wave enters a new medium.
When this happens, the speed of the wave changes according to:
[tex]v=\frac{c}{n}[/tex]
where c is the speed of light in a vacuum and n is the index of refraction.
The frequency of the wave does not change when the wave enters the new medium, while the wavelength changes according to:
[tex]\lambda' = \frac{\lambda}{n}[/tex]
where [tex]\lambda[/tex] is the original wavelength and [tex]\lambda'[/tex] is the wavelength in the medium.
Also, the direction of the wave changes according to Snell's law:
[tex]n_i sin \theta_i = n_r sin \theta_r[/tex]
where
[tex]n_i[/tex] is the index of refraction of the first medium
[tex]n_r[/tex] is the index of refraction of the second medium
[tex]\theta_i[/tex] is the angle of incidence (measured with respect to the normal to the interface between the two mediums)
[tex]\theta_r[/tex] is the angle of refraction (measured with respect to the normal to the interface between the two mediums)
