Question

When light goes from one medium to another than which parameter of light wave remain
constant?
(a) Frequency (b) Wavelength
(c) Velocity (d) Amplitude

Answer 1

Frequency

The frequency of the light ray remains same when it travels from one medium to another because it depends on the source of light. But the wavelength and speed vary because they depend on the medium through which the light passes.

Answer 2

Answer:

When light travels from one medium to another, the speed changes, as does the wavelength. ... Although the speed changes and wavelength changes, the frequency of the light will be constant