Question

When light travels from one medium to another medium which are separated by a sharp boundary, the characteristic which does not change is:

• A. velocity
• B. wavelength
• C. frequency
• D. amplitude

Answer 1

The correct option is C frequency

Answer is C.
Color and energy depend on frequency and frequency does not change. The light photons are the same as the photons at the beginning. Frequency is a parameter of the source of emission of light, not the medium it is travelling through.
Therefore, the When light travels from one medium to another medium which are separated by a sharp boundary, the frequency does not change.