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When the light travels from air into plastic, at an angle other than 0°, how is it bent in relation to the normal?
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When the light travels from air into plastic, at an angle other than 0°, how is it bent in relation to the normal?

User Craig Kelly
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The normal is a line perpendicular (forming a 90 degree angle) to the boundary between the two substances. The bending occurs because light travels more slowly in a denser medium.
User Robin Watts
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