Final answer:
In Physics, a convex surface curves outward, and a concave surface curves inward. When two surfaces are both convex and concave at right angles, it means one is a convex mirror and the other is a concave mirror. Both mirrors have unique properties and are used in various optical devices.
Step-by-step explanation:
In Physics, a convex surface curves outward like the exterior of a sphere, while a concave surface curves inward like the interior of a sphere. When two surfaces are both convex and concave at right angles to each other, it means that one surface is shaped like a convex mirror and the other is shaped like a concave mirror.
An example of a convex mirror is the side mirror on a car. It reflects light outwards and forms a smaller, virtual image. On the other hand, a concave mirror, like the inside surface of a spoon, reflects light inward and forms a larger, real image.
Both convex and concave mirrors have unique properties that make them useful in various optical devices and applications.