Which kind of mirror, concave or convex, is used in each place?

Step 1. (a) Dentist: concave. The tooth is inside the focus, so the mirror gives a larger, upright image.

Step 2. (b) Headlight: concave. The lamp is at the focus, so the light leaves as a parallel beam that goes far.

Step 3. (c) Side mirror: convex. It shows a wide view of the road, upright.

Step 4. (d) Shop corner: convex. The same wide view lets the shopkeeper see the whole floor.