How do you find the angle of reflection off of a mirror?

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The angle of reflection (θr) off a planar surface (eg. mirror) is equal to the angle of incidence (θi) on that surface. They are measured with respect to the normal, which is an imaginary line drawn perpendicular to the surface.

Or, in simpler terms, the angle of reflection is the same as the angle of incidence.
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In Science

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