A) Convex mirror
B) cylindrical mirror
C) Plane mirror
D) concave mirror
Correct Answer: D
Solution :[d] Concave mirrors are used by dentists because at a short range (object distances less than the focal length) they produce magnified, upright images. It is useful to have a magnified image of a tooth when you're looking for or repairing cavities, cracks, or other abnormalities.
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