When light waves travel from air to glass which variables are affected ...

When light waves travel from air to glass, which variables are affected?

Wavelength and velocity only

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Velocity of the wave = frequency x wavelength

We know that velocity of wave changes and frequency doesn't. 

As the wave is traveling from a rarer medium to a denser medium.

Velocity of the light decreases, frequency remains same and hence wavelength decreases.

By: Abhipedia