Use the law of reflection to explain why you see only a portion of the area behind you when you look in a mirror?

When you look in a mirror, the law of reflection states that the angle of incidence (the angle at which light hits the mirror) is equal to the angle of reflection (the angle at which light is reflected off the mirror). This means that you see only a portion of the area behind you because light from different parts of the scene is reflected at different angles, resulting in only a subset of the scene being visible in the mirror.