75
2.5.12 Mirror
Mirror is an object that reflects light from its surface, with little or no diffusion. The
common terms associated with respect to mirror are given in Table 2.9.
2.5.12.1 Law of Reflection
The law of reflection states that:
1. The reflected ray, the incident ray, and the normal to the surface of the mirror lie
in the same plane.
2. The angle of incidence is equal to the angle of reflection (Fig. 2.25).
2.5.12.2 Application of Optics in Environmental Health
Optics has many applications in environmental science and health. Some of them
are as follows:
Image
f
f
f
Fig. 2.19 Line diagram showing the object at f
Image
f
f
f
f
Fig. 2.20 Line diagram showing the object between f and o
2.5 Optics