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What is meant by 'reflection of light'? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:- Incident ray
- Point of incidence
- Normal
- Reflected ray
- Angle of incidence
- Angle of reflection
The process of sending back light rays that fall on the surface of an object is called reflection of light.
(a) Incident ray: The ray of light that falls on the mirror is called the incident ray. In the given figure above, AO is the incident ray of light.
(b) Point of incidence: The point at which the incident ray falls on the mirror is called the point of incidence. In the given figure, point O on the surface of the mirror is the point of incidence.
(c) Normal: The normal is a line at the right angle to the mirror surface at the point of incidence. In the given figure, the line ON is the normal to the mirror surface at point O.
(d) Reflected ray: The ray of light which is sent back by the mirror is called the reflected ray. In the given figure, OB is the reflected ray of light.
(e) Angle of incidence: The angle of incidence is the angle made by the incident ray with the normal at the point of incidence. In the given figure, the angle ∠AON is the angle of incidence, and it is denoted by the letter i.
(f) Angle of reflection: The angle of reflection is the angle made by the reflected ray with the normal at the point of incidence. In the given figure, the angle ∠NOB is the angle of reflection, and it is denoted by the letter r.
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