Final answer:
Light interacts with plane mirrors by reflecting off the mirror surface according to the law of reflection. The reflected light strikes the observer's eyes, allowing them to see the mirror image. Light does not pass through the mirror, but rather reflects off the mirror surface.
Step-by-step explanation:
Light interacts with plane mirrors by reflecting off the mirror surface according to the law of reflection. When light strikes a mirror, it bounces off the mirror and reflects in a way that the angle of incidence is equal to the angle of reflection.
The light that is reflected off a mirror strikes the observer's eyes, allowing them to see the mirror image. The image formed by a plane mirror appears to be behind the mirror but is not a figment of imagination. Light does not pass through a mirror to a common point behind the mirror. Instead, it reflects off the mirror surface and provides the observer with a reflected image.