Mirror used by dentist to see large images of teeth of patients is ...............

Concave Mirror

The correct answer is option 4. Concave Mirror.

The mirror used by a dentist to see large images of teeth is a Concave Mirror. Concave mirrors have a curved surface that bends inward. This curvature allows them to converge incoming light rays, forming an enlarged (magnified) image. Dentists need a magnified view of the teeth to examine them for cavities, cracks, or other issues. A concave mirror provides this magnification, making it ideal for dental examinations.

On the other hand:

Plane mirrors reflect light without changing its size, so they wouldn't be helpful for magnification.

Convex mirrors have a curved surface that bulges outward, creating a diminished (minified) image. This wouldn't be suitable for detailed dental examinations.

Zigzag mirrors are not a standard tool in dentistry.