In English, a mirror is an object with a smooth surface and can reflect light. At first, the ancients used polished bronze as mirrors. There are two kinds of mirrors: flat mirror and curved mirror. Flat mirrors are often used to tidy up the appearance, and curved mirrors are divided into concave mirror and convex mirrors, which are mainly used as dressing mirrors, furniture accessories, architectural decoration parts, optical instruments, solar cookers, reflectors for headlights and searchlights, reflecting telescope, car rearview mirrors, etc.

In science, mirrors are often used in telescopes, lasers, industrial instruments and other instruments. Metal devices with regular reflective surfaces and glass or metal products with metal reflective films are often inlaid with metal, plastic or wooden frames.

Reflection:

The mirror's reflection of light obeys the law of reflection, and its reflection ability depends on the angle of incident light, the smoothness of the mirror and the properties of the plated metal film. The imaginary line perpendicular to the mirror is called the normal, and the angle between the incident light and the normal is equal to the angle between the reflected light and the normal.

The object in front of the plane mirror becomes an upright virtual image behind the mirror, and the distance from the virtual image to the mirror surface is equal to the distance from the object to the mirror surface. If you want to see my whole length in the mirror, the mirror must be at least half my length, because the incident angle is equal to the reflection angle. The reflective surface of concave mirror faces the center of curvature.