answer in one statement:
1) What is the angle of incidence when a ray of light strikes normally on a plane mirror ?
2) What is the name given to a perpendicular line drawn from the point of incidence of a plane mirror ?
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Explanation:
1. Hence, angle of incidence = angle of reflection = 30 degrees. The incident ray will have an angle of reflection of 30 degrees (made with a surface normal to the mirror surface
2. The line NO that is perpendicular to the plane mirror surface and drawn at the point of incidence is called the normal.
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Answer:
If a ray of light is incident normal to the surface of the plane mirror, then the angle of incidence is 0
0
, as the normal passes perpendicularly to the mirror.
Case (b):
The Second Law of Reflection states that the angle of incidence is always equal to the angle of reflection. Therefore, the angle of reflection is same as the angle of incidence, that is, 0
0
. So, the reflected ray will retrace the path of the incident ray.
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