the focal length of a concave lens is taken negative.
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For focal length, f in lens is always taken as negative for concave and positive for convex. In case of mirror the f is taken as negative if it is in -X side i.e., is in Concave mirror and taken as positive if it is in +X side i.e., is in Convex mirror.
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Explanation:
Yes bro and convex lens is taken positive
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