The index of refraction does not affect frequency directly. Frequency is a measure of how many waves pass a point in a given amount of time and is measured in hertz (Hz). The index of refraction, on the other hand, is a measure of how much the speed of light slows down when passing from one medium to another and is measured in dimensionless units.

While the index of refraction does not affect frequency, it does affect wavelength. The wavelength is the distance between two consecutive peaks or troughs of a wave and is inversely proportional to the frequency. Therefore, as the index of refraction increases, the wavelength decreases and vice versa. This is because the index of refraction is a measure of how much the light is slowed down, so a higher index of refraction means a slower speed of light and a shorter wavelength.

In summary, while the index of refraction does not directly affect frequency, it does affect wavelength, which is inversely proportional to frequency.