* Frequency remains constant: The frequency of an electromagnetic wave is determined by the source of the wave (e.g., the vibration of electrons in an antenna). This fundamental property doesn't change as the wave travels through different mediums.
* Speed decreases: The speed of light in a vacuum is the fastest possible speed for light. When light enters a denser medium like glass, its speed decreases. This is because the light interacts with the atoms in the glass, causing it to slow down.
Explanation:
The relationship between frequency (f), speed (v), and wavelength (λ) of an electromagnetic wave is given by:
v = fλ
Since the frequency (f) remains constant, and the speed (v) decreases in glass, the wavelength (λ) must also decrease. This means the wave "compresses" as it enters the glass.
Important Note: The change in speed is what causes the bending of light (refraction) when it passes from one medium to another.
