Reflection is bouncing back of light from a surface. It goes back in the same medium. Refraction is bending of ligth. It happens when light travels from one medium to another. Eg-a coin in a glass of water appears to be above its actual position because of refraction
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Refraction of Light : Happens in Transparent medium when a light travels from one medium to another, refraction takes place. A ray of light bends as it moves from one medium to another. Refraction is due to change in the speed of light as it enters from one transparent medium to another. For example :A fish kept in aquarium appear to be bigger than its actual size.
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