The angle of incidence is the angle between the incident ray and
the normal (perpendicular) to the reflecting surface.
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It is the angle between an incident ray and the perpendicular to
the surface at the point of incidence.
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The incident angle to the Mirror will be 10 deG.
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yes
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The angle of incident is 45 degrees. The incident and reflected
ray have the same magnitude and if the sum of the magnitudes is 90
degrees the incident is 45 degrees.