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Which of the following mirror is used by a dentist to examine a small cavity? (a) Concave mirror

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Which of the following mirror is used by a dentist to examine a small cavity? 

(a) Concave mirror 

(b) Convex mirror 

(c) Combination of (a) and (b) 

(d) None of these

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(a) Concave mirror

A concave mirror, because it forms erect and enlarged image when held closer to the cavity.

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