When the ray travels from glass to air, ∠ i ∠eĪ student performed the experiment of tracing the path of light through a glass slab as shown. When the ray of light travels from denser to rarer medium, its speed goes up and the ray bends away from the normal (∠i ∠ r.When a light ray travels from rarer to denser medium, its speed gets slow down and the ray bends towards normal (∠i >∠r).During the refraction, when light travels from one medium to another transparent medium, the speed and wavelength of light changes, whereas frequency remains the same. This is due to the change in speed of light while going from one medium to the other. This phenomenon exhibited by the light rays is called refraction of light.
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