yes it is decreased in proportion to the refractive index of the medium
Yes, the speed of light decreases when entering a different medium such as water compared to its speed in a vacuum. This is due to the change in the refractive index of the medium, which affects the speed at which light can travel.
refraction
The absolute refractive index of a medium is a measure of how much light is slowed down when passing through that medium compared to the speed of light in a vacuum. It is a ratio of the speed of light in a vacuum to the speed of light in the medium. The absolute refractive index is a fundamental property of the material and is used to calculate how light rays will bend when entering or exiting the medium.
The speed of light is not medium: in vacuum, it is the highest speed that there can be. Hardly a definition of medium!
If the frequency of the light wave is decreased by a factor of 2, the wavelength will double. This is because the speed of light remains constant in a given medium, so as frequency decreases (and energy decreases), wavelength increases to maintain the speed of light.
When light enters a different medium, the amount that the light is bent as it enters the medium is determined by the medium's index of..........=refraction
No options are given to answer the question
No, light in a medium will travel at a slower speed.
c divided by the index of refraction of the medium = the speed of light in the medium.
When light enters a prism, it slows down and bends because it changes speed as it moves from one medium (air) to another medium (glass) with a different refractive index. This change in speed causes the light to bend, or refract, as it enters the prism.
That quotient is the refractive index of that medium.
It is usually expressed the other way: the ratio of the speed of light in a vacuum to the speed of light in a medium. In that case, it is called the "index of refraction".