Question

which type of mirror has focal length in negative and which has positive​

Answer 1

Answer:

Any distances measured on that side are positive. Distances measured on the other side are negative. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted.

Answer 2

Answer:

convex mirrors have negative focal length and concave have positive focal length

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