![]() Page No 174:Ĭonsider a small object (a point source of light), placed in front of a plane mirror MM' (figure 1). The angle of reflection is denoted by the letter r. In the figure, the angle NOB is the angle of reflection. (f) Angle of reflection: The angle of reflection is the angle made by the reflected ray with the normal at the point of incidence. The angle of incidence is denoted by the letter i. In the figure, the angle AON is the angle of incidence. (e) Angle of incidence: The angle of incidence is the angle made by the incident ray with the normal at the point of incidence. The reflected ray of light shows the direction in which the light travels after being reflected from the mirror. ![]() ![]() In the figure, OB is the reflected ray of light. (d) Reflected ray: The ray of light that is sent back by the mirror is called the reflected ray. In the figure, the line ON is the normal to the mirror surface at point O. (c) Normal: The normal is a line at right angles to the mirror surface at the point of incidence. In the figure, the point O on the surface of the mirror is the point of incidence. (b) Point of incidence: The point at which the incident ray falls on a mirror is called the point of incidence. The incident ray gives the direction of the light falling on the mirror. In the figure, AO is the incident ray of light. (a) Incident ray: The ray of light that falls on a mirror is called the incident ray. The process of sending back light rays that fall on the surface of an object is called reflection of light.
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