Here's why:
* Frequency is a fundamental property of the light wave itself, determined by the source of the light. It represents the number of wave cycles passing a point per second.
* When light enters a different medium, its speed changes (because the speed of light depends on the medium).
* The change in speed also affects the wavelength, which is the distance between two successive crests or troughs of the wave.
* However, the frequency remains constant. This is because the frequency is directly related to the energy of the light, and energy is conserved.
In summary:
* Frequency: Remains the same
* Speed: Changes
* Wavelength: Changes
