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A [[1]] mirror has positive focal length and [[2]] mirror has negative focal length.

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Detailed Solution

A concave mirror has positive focal length and convex mirror has negative focal length.
In the “New Cartesian Sign convention” for mirrors, the sign has been given that the concave mirror has a negative focal length and a convex mirror has a positive one.
For a concave mirror, the focal length is negative, and that of a convex mirror is positive. As the focus of a concave mirror is in front of the mirror, on the left side, the focal length of a concave mirror is negative. As the focus of a convex mirror is behind the mirror, on the right side, the convex mirror has a positive focal length.

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