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Refraction of light is the change in direction of light when light passes from one medium to another obliquely.
This Refraction leads to some interesting phenomena, like
Pencil partly immersed in water appears to be bent
When a glass is placed over piece of paper, writing appears higher
Stars appear to twinkle at night
Optical Illusion like Mirage is due refraction of light
Like the road appears wet during hot days
