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What is the name of the line drawn perpendicular to the surface where a light ray strikes?

What is the name of the line drawn perpendicular to the surface where a light ray strikes?
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What is the name of the line drawn perpendicular to the surface where a light ray strikes?

User Michael Anderson
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This line is known as a normal line (labeled N in the diagram). The normal line divides the angle between the incident ray and the reflected ray into two equal angles.
User LievenV
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