* Amplitude: This is the maximum displacement of the electric field in an electromagnetic wave (light). It represents the strength of the wave.
* Intensity: This is the power per unit area carried by the light wave. It's directly proportional to the square of the amplitude.
What actually happens when light enters a new medium:
1. Refraction: The light wave changes direction due to the change in the speed of light in the new medium.
2. Transmission and Reflection: Some of the light is transmitted through the new medium, and some is reflected back.
3. Absorption: Some energy from the light wave might be absorbed by the medium, reducing the intensity.
Key points:
* While the amplitude itself doesn't directly change, the *energy* carried by the light wave can be affected, leading to changes in intensity.
* If the medium is transparent, the energy carried by the light wave is mostly transmitted, leading to a relatively small change in intensity.
* If the medium is opaque or absorbs light, the energy is significantly reduced, leading to a much lower intensity.
In summary:
The amplitude of light doesn't change when it enters a new medium. However, the intensity of the light can change due to refraction, reflection, and absorption.
