When a light wave enters from one medium to another medium, which of the following quality does not change1 pointdirectionvelocityfrequencywavelength

When a light wave passes from one medium to another, its frequency does not change. Here's why:

1. When light travels from one medium to another (like from air to water), it changes speed. This is because different mediums have different optical densities, which affect the speed of light.

2. This change in speed also causes the light to change direction, a phenomenon known as refraction. The light bends towards the normal if it slows down, and away from the normal if it speeds up.

3. The wavelength of the light also changes when it enters a new medium. This is because wavelength is directly related to the speed of light and the medium's optical density.

4. However, the frequency of the light does not change. This is because frequency is determined by the source of the light, not the medium it's traveling through. So, no matter what medium the light enters, its frequency remains the same.