What happens to the ray of light when it travels from glass to water?

Glass and water are thicker and heavier than air. They are said to be 'denser' than air. What happens is that light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction.

Glass is denser than Water, therefore, a ray of light travelling from Water to Glass will bend towards the normal and slow down. Glass has a higher refractive index than water.

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