Question

If speed of light is constan thn how does speed decress in water

Answer 1

HERE IS UR ANS:
Speed of light is constant in vacuum. When it passes through a medium, it is assumed to pass through the atoms which have vast amount of empty space. Radius of an atom is bigger than radius of nucleus. Light passes through this empty space at constant speed and when it comes in contact with electrons, it energizes them to go up-to higher energy level. Since the energy levels are fixed as per quantization theory of energy, if the electrons do not reach the next higher energy level, they emit the entire light that they had absorbed. Time lag in absorbing and remission of light by electrons slows down the light. Though, most of the distance traveled by the light through the medium is at constant speed, but the net effect becomes reduced speed as per the refractive index of the medium.


PLZ MARK AS BRAINLIEST ✌️✌️

Answer 2

Hello Sweety❤❤
here's ua answer :
As there is a medium change, the speed of light will slightly change. In this case, it would slightly decrease. Hence due to refraction from a prism, the speed of light has decreased. The speed of light is constant in a vacuum but in any another medium it is slightly slower.
▪▪OR▪▪
The speed of light does not slow down; light itself does. ... The answer: Light only travels at in a vacuum. When light is passing through a medium (e.g., water), it slows down. That is because photons interact with atoms, which repeatedly absorb and re-emit them to the same direction.