Introduction:
A diverging mirror, also known as a convex mirror, is a type of mirror that curves outward. It is called a diverging mirror because it causes incident light rays to spread out or diverge after reflection.

Explanation:
1. Concave Mirror:
A concave mirror is a type of mirror that curves inward. It is also known as a converging mirror because it causes incident light rays to converge or come together after reflection. Concave mirrors are used in various applications such as telescopes, shaving mirrors, and headlights.

2. Plane Mirror:
A plane mirror is a flat mirror with a reflective surface. It reflects light rays in a straight line without any curvature. Plane mirrors produce virtual images that are upright and have the same size as the object. They are commonly used in everyday situations, such as in dressing mirrors and rear-view mirrors.

3. Convex Mirror:
A convex mirror is a type of mirror that curves outward. It is also known as a diverging mirror because it causes incident light rays to spread out or diverge after reflection. Convex mirrors have a reflective surface that bulges outwards, resulting in a wider field of view compared to concave mirrors. They are commonly used in applications such as security mirrors, side-view mirrors on vehicles, and in some decorative mirrors.

4. Conclusion:
In summary, a diverging mirror is called a convex mirror. It is characterized by its outward curvature and the ability to cause incident light rays to spread out or diverge after reflection. This is in contrast to a concave mirror, which curves inward and causes light rays to converge. A plane mirror, on the other hand, has a flat reflective surface and does not cause any curvature or divergence of light rays.