We're used to regular mirrors: Flat mirrors, mounted on a vertical surface. But when they're tilted—or better yet, curved—mirrors can show us things we might not expect.

For example, here is what Melissa looks like in a regular mirror:

But when she looks in two curved mirrors, this is what she sees:

Now, these two mirrors have gentle curves, but one is concave and the other is convex. Here are side views:

Concave

Convex

Before you go to the next page try to figure out which image goes with which type of mirror. Choose one of the possibilities:

Theory 1: The concave mirror makes you tall, while the convex mirror makes you short.

Theory 2: The convex mirror makes you tall, while the concave mirror makes you short.