Concave Mirrors. A concave mirror is a mirror that is curved inward in the middle. It might help you to remember this if you think that when you look in a concave mirror, it looks like you are looking into a cave. The equation we use when dealing with concave mirrors is called the mirror equation.
A convex mirror is in the shape of a curve, and the reflecting surface bulges outward toward the source of light. Because convex mirrors reflect the light in an outward direction, they do not serve to focus light.