Harry is reading an online summary of the law of reflection. The site states that after light hits a mirror, the angle of reflection is the angle between the reflected ray and the normal, which is the surface of the mirror. Which statement corrects an error on the site?
Answer
A
The normal is a line perpendicular to the incoming ray.
B
The angle of reflection is the angle between the incoming ray and the normal.
C
The angle of reflection is the angle between the reflected ray and the incoming ray.
D
The normal is a line perpendicular to the surface of the mirror.
Explanation
The normal is an imaginary line perpendicular to the mirror’s surface at the point where the light strikes. The angle of reflection is measured between the reflected ray and this normal, not between the reflected ray and the mirror’s surface. Therefore, choice D corrects the site’s error.
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