The mirror used by the dentists to see the teeth of the patients is

The correct answer is (a) convex.

A convex mirror is a curved mirror that bulges outward at the center. It forms a virtual image that is upright and smaller than the object. This type of mirror is often used in dentists’ offices to allow dentists to see the back of patients’ teeth.

A concave mirror is a curved mirror that bulges inward at the center. It forms a real image that is upright and larger than the object. This type of mirror is often used in telescopes and microscopes to magnify objects.

A plane mirror is a flat mirror. It forms a virtual image that is upright and the same size as the object.

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