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The focal length of which mirror is taken as negative according to the convention of signs?

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The focal length of which mirror is taken as negative according to the convention of signs?

(A) Plane mirror

(B) Concave mirror

(C) Convex mirror

(D) None of these

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Correct option is (B) Concave mirror

Focal length is positive for a convex mirror and negative for concave mirror.

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