Wave aspect of light?

Question

What is the ratio of thickness of crown glass and water that would contain the same number of wavelengths of light?

Answer 1

I'm pretty sure it's 1:1. When light crosses from one material to another, only the speed of the light wave is changed, but the wavelength would remain constant. Otherwise, everything seen through glass (or water) would have a perceptible tint.

Answer 2

My be it is 1 to 1.

The wavelength is not changing when a wave leaves one material and goes into another. The direction is changed in the surfaces.

Some waves has bad capacity going through some materials.

Light through concrete for instance.

Long waves goes better in heavy materials than short waves.

The bass goes better than the discant in solid materials.