_________ are used by dentists to see an enlarged image of the teeth.

The correct answer is Concave mirrors.

Key Points 

• Concave mirrors are spherical mirror in which the reflecting surface curved inwards.
• A concave mirror forms a virtual or real image depending on the position of the object.
• Concave mirrors are used by dentists to see an enlarged image of the teeth.
• Other important uses of Concave mirrors are:
  • ​Used in torches.
  • Used in solar cooker.
  • Used in search-lights and vehicles headlights to get powerful parallel beams of light.
  • Used as shaving mirrors to see a larger image of the face.
• Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.

Additional Information 

• Convex mirrors are the spherical mirrors in which the reflecting surface curved outwards.
• The important uses of a convex mirror are:
  • Used as rear-view mirrors in vehicles.
  • Used for Security purposes.
• Plane mirrors are used in Periscopes and kaleidoscopes.