does amplitude of light change during refraction?

During refraction there is always some light that is reflected and some that is transmitted.

So the amplitude of the transmitted wave must reduce after each refraction.

At Brewster’s angle: No

Otherwise: Yes

If the amplitude of the REFLECTED radiation(light) is zero then no, the amplitude of the radiation will not change, the REFRACTED amplitude will be the same as the incident amplitude

If you use Maxwell’s equations and assume the incoming waves are plane waves and polarized in one direction you can show that some of the amplitude of the initial electromagnetic radiation (light) is refracted and some is reflected.

However, there are some special cases:

1. If the angle of incidence is equal to the “Brewster angle” then all of the incident radiation (light) is refracted. So the amplitude of the refracted radiation is the same as the incident radiation. Note that this is not the same for unpolarized incident radiation

2. If the angle of incidence is greater than the “Critical angle” all of the incident radiation is reflected. So the incident amplitude is equal to the reflected amplitude and the refracted amplitude is zero.

no never

it cant

amplitude and frequency dont change on refraction