I'm afraid nothing happens to the speed of light ever. Also "air" is consider'd a gas.
When light changes speed, it bends or refracts. This affects its behavior by causing it to change direction when it moves from one medium to another, such as from air to water. This phenomenon is known as refraction.
The frequency of light remains constant as it changes medium from air to water. However, the speed and wavelength of light will change, causing it to bend or refract.
It gets faster. As a result, it also changes its direction.
The speed decreases.
The speed increases.
It increases.
Assuming the speed of light in air is already known (it is close to the speed of light in a vacuum), you might check how the light refracts when it changes from air to water (at what angle), and then use Snell's Law.
Light changes speed and direction when it goes from air into glass. This phenomenon is known as refraction. The change in speed causes the light to bend, which is why objects may appear distorted when viewed through a glass surface.
The speed of light changes if the density of medium changes. In hot air, the density is less so due to the change in speed of light, we think that it is flickering.
The frequency of light remains constant when passing from air to water. However, the speed of light changes due to the change in the medium, causing the wavelength to change. This change in wavelength results in the light bending or refracting at the interface between air and water.
Light is refracted as it moves from air into glass because the speed of light changes as it travels from a less dense medium (air) to a more dense medium (glass). This change in speed causes the light rays to bend, resulting in refraction.
its frequency remains constant but velocity changes.