* Speed Decreases: Light travels slower in denser mediums. Solids are generally denser than liquids, so the speed of light will decrease as it moves from the liquid to the solid.
* Wavelength Decreases: The wavelength of light is directly related to its speed. Since the speed decreases, the wavelength also decreases.
Why does this happen?
* Index of Refraction: The speed of light in a medium is determined by its index of refraction (n). This value represents how much the speed of light is reduced compared to its speed in a vacuum. Solids have a higher index of refraction than liquids, meaning light travels slower in them.
* Interaction with Matter: Light waves interact with the atoms and molecules in the medium. In denser materials, there are more particles for light to interact with, leading to more scattering and absorption, which slows it down.
Important Note: The frequency of light remains constant as it passes from one medium to another. This is because frequency is a property of the light source and doesn't change with the medium.
Example:
Imagine light passing from water (liquid) into a glass prism (solid). The light will slow down and bend (refract) as it enters the prism, because the prism has a higher index of refraction than water. The wavelength of the light will also decrease.
