what is refraction ? refraction happened when light travels from vaccum to air.
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Refraction is an effect thatoccurs when alight wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. Lightis refracted when it crosses the interface from air into glass in which it moves more slowly.
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when a light travels and it touches to a surface when it touches a surface it change its way is called refraction.
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