Question

When light travels from a rarer to a denser medium, the speed of light in the medium _______

Answer 1

The speed of light in a medium:

1. A translucent substance that allows light to pass through is called a medium.
2. An optically rarer medium is one in which the speed of light is higher. Compared to glass and water, the air is an optically rarer media.
3. Optically denser mediums are those in which the speed of light is slower.
4. The term "refraction of light" refers to how light bends when it travels perpendicularly through transparent media.
5. The refractive index is a measurement of how much a light beam bends as it passes through various materials.
6. The speed of light in a medium reduces as it moves from a rarer to a denser one.

Therefore, when light travels from a rarer to a denser medium, the speed of light in the medium decreases.