Mirrors 221 A plane mirror

The simplest and most common mirror of all is, of course, a plane mirror. Consider Alice, standing in a well-lit room. Some of the light scattered from Alice goes to the mirror and is reflected. We all know that the result is an image of Alice, looking back, apparently standing at an equal distance on the other side of the mirror.

In Figure 2.4, we trace the path of the light rays as they obey the law of reflection at the mirror. Let us concentrate on those rays which return to Alice's eyes and are seen by her. Only two rays need to be traced: one from the top of her head and the other from her toe. Both rays return directly to her eyes, as illustrated in the diagram. There is no point in extending the

0 0

Post a comment