Final answer:
A convex mirror is designed to reduce blind spots by providing a wider field of view in vehicles. Objects appear smaller in such mirrors, prompting the warning 'Objects in the mirror are closer than they appear.'
Step-by-step explanation:
The type of mirror designed to eliminate as much of the blind spot as possible is a convex mirror. Convex mirrors, also known as diverging mirrors, provide a wider field of view than flat mirrors. This feature allows drivers to see more area behind them, thus reducing blind spots. However, objects in a convex mirror appear smaller due to the way the mirror diverges light rays. As a result, the objects are closer than they appear to the driver, which is often indicated by a warning on the mirror itself. Experimentally, you can confirm the shape of the mirror by observing that the reflection gets smaller as you move away from the mirror, consistent with the properties of a convex surface.