The angle formed from the ray approaching the mirror and the normal (imaginary line that's perpendicular to the mirror) is equal to the angle formed by the reflected ray and the normal.
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In this image, angle I and angle R are equal
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The angle is the same but on the other side of the perpendicular to the surface of the mirror at the point at which the light hits the mirror.
The distance of the object from the mirror line should equal the distance of the image from the mirror line.
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Set up a light source that has narrow beam (a laser pointer is perfect for this).Point it at a mirror,measure the angle of incidence and of reflection.rotate the mirror,measure the angles,continue through many angles,tabulate and graph the results.
If you're talking about a flat mirror, yes. Both angles are measured in relation to the mirror's normal. A flat mirror's normal is the perpendicular line that extends from the point of contact from the beam of light on the mirror outward.