why light waves are refracted at a boundary between two materials
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. Light waves change speed when they pass across the boundary between two substances with a different density , such as air and glass. This causes them to change direction, an effect called refraction . ... the light slows down going into a denser substance, and the ray bends towards the normal
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Answer:REFLECTION
Explanation: Light waves change speed when they pass across the boundary between two substances with a different density , such as air and glass. This causes them to change direction, an effect called refraction . The light slows down going into a denser substance, and the ray bends towards the normal.
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