Which type of mirror is used by the dentist?

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Plane

Convex

Concave

Both (2) and (3)

answer is C.

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Detailed Solution

Concept: Since dentists must look into our mouths to check for cavities or bacterial infections, Therefore, we want a tool to conveniently display the interior region of teeth (molars) .
Concave mirrors are those in which the reflecting surface is bowed inward while the outer surface is polished.
Concave mirrors are used by dentists to see teeth and other regions of the mouth. When an item is put into focus, a concave mirror creates a virtual, erect, and magnified picture.
These mirrors provide a brighter, larger-than-life picture of the original item without flipping it, allowing dentists to examine the interior of teeth and the inside of the mouth with greater ease.
Hence, the correct option is 3.

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