Achange in the speed of a wave as it enters a new medium produces a change in

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:

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:

where is the original wavelength and is the wavelength in the medium.

Also, the direction of the wave changes according to Snell's law:

where

is the index of refraction of the first medium

is the index of refraction of the second medium

is the angle of incidence (measured with respect to the normal to the interface between the two mediums)

is the angle of refraction (measured with respect to the normal to the interface between the two mediums)

15.3 cos 65 degrees trig