When light waves pass from air to glass, the variables affected are

1. When light waves pass from one medium (like air) to another medium (like glass), the phenomenon of refraction occurs. 2. The frequency of the light wave depends only on the source of the light and does not change when the light enters a different medium. 3. The velocity of light changes when it passes from one medium to another. Light travels slower in denser media (like glass) compared to rarer media (like air). 4. The wavelength (λ), velocity (v), and frequency (f) are related by the equation v = fλ. Since v changes and f remains constant, the wavelength (λ = v/f) must also change. 5. Therefore, the variables affected when light passes from air to glass are wavelength and velocity.