Explanation:

Shaving mirrors are usually concave mirrors. The reason for this is the properties of concave mirrors which makes them suitable for use as a shaving mirror.

Concave Mirrors:

Concave mirrors are curved mirrors that are spherical in shape. They are also known as converging mirrors because they converge the light rays that fall on them.

Properties of Concave Mirrors:

The following are the properties of concave mirrors that make them suitable for use as shaving mirrors:

1. Magnification: Concave mirrors have the ability to magnify the image formed in front of them. This property is useful for shaving as it allows the user to see a magnified image of their face.

2. Focus: Concave mirrors have a focal point where all the reflected light rays converge. This property is useful for shaving as it allows the user to see a clear and focused image of their face.

3. Reflection: Concave mirrors reflect light in a way that the image formed is upright and real. This property is useful for shaving as it allows the user to see a clear and accurate image of their face.

Conclusion:

In conclusion, shaving mirrors are usually concave mirrors because of their ability to magnify, focus and reflect light in a way that produces a clear and accurate image of the user's face.