# PHYS 2212 Module 14.2

## Spherical Mirrors

14.2 Spherical Mirrors

### Learning Objectives

By the end of this section, you will be able to:

• Describe image formation by spherical mirrors.
• Use ray diagrams and the mirror equation to calculate the properties of an image in a spherical mirror.

### Images Formed by Spherical Mirrors

We already briefly discussed how you see an image formed by a flat mirror. Now we will look at images from curved mirrors. You actually see these all the time, but maybe never thought about how they work.

A concave mirror is a curved mirror whose reflective side is on the inside of the curve, like here:

A convex mirror is a curved mirror whose reflective side is on the outside of the curve, like here:

Practice!

### Mirror Equations

#### The Mirror Equation and Magnification

The mirror equation is:

and the magnification is:

The sign conventions are:

Practice!

Discuss!

An automobile rear-view mirror shows an image of a truck at a time when the truck is 3.0 m from the mirror. The focal length of the mirror is -0.58 m.

(a) Find the position of the image of the truck.

(b) Find the magnification of the image.