How well do you know convex mirrors?

convex mirrors

A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (recessed inward). Among them, convex mirrors are the most common in life.

principle of convex mirrors

A convex mirror or diverging mirror is a curved mirror in which the reflective surface bulges towards the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. Such mirrors always form a virtual image, since the focal point (F) and the center of curvature (2F) are both imaginary points “inside” the mirror, that cannot be reached. As a result, images formed by these mirrors cannot be projected on a screen, since the image is inside the mirror


The convex mirror manufacturing process is divided into glass molding and mirror plating. In the factory, workers cut the glass into a round shape, then put it in a customized mold, put it into the furnace, and adjust the temperature according to the required arch height. The glass softens at high temperatures and naturally sags to form a curved surface. Because it relies on softening to sag naturally, the error range of the arch height is relatively large. The inspection standard is mainly based on the qualified diameter. After cooling, the qualified products are selected and sent to the plating mirror. The colored convex mirror uses colored glass as the raw material, and the silver convex mirror uses low-iron glass as the raw material.

Uses of convex mirrors

The convex mirrors that everyone sees in life are generally the plexiglass mirrors in the rear mirrors of cars or intersections. In fact, convex mirrors are also widely distributed in home and hotel decorations. This is a style that has been handed down since the Middle Ages.

Round convex mirrors called Oeil de Sorcière (French for “sorcerer’s eye”) were a popular luxury item from the 15th century onwards, Famous examples in the art include the Arnolfini Portrait by Jan van Eyck and the left-wing of the Werl Altarpiece by Robert Campin.


This is a popular decoration that has continued from the Middle Ages and is more common in luxurious decoration. The colored convex mirror looks like a beautiful gem from a distance, and its colors are pink, blue, black, and silver. The outer frame is generally made of brass (simple style), and gold and silver frames (luxury style) are also used. Using a suitable outer frame can make your room shine.


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