Difference between rarer to denser and denser to rarer

1.	Difference between rarer to denser and denser to rarer
Answer» 1.In light ray pass from rarer to denser medium it bend to normal ray.2.The speed of light become slow.1.In light ray pass from denser to rarer medium it away to normal ray.2. The speed of light become fast. When a beam of light passes from rarer to denser medium say air to glass it bents toward normal but when light goes from deser to rarer say glass to air light goes away from normal

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