Is focal length positive or negative in convex mirror.

1.	Is focal length positive or negative in convex mirror.
Answer» Focal length\xa0formula for\xa0mirror\xa0is 1/F=1/V+1/u, where V is the\xa0distance\xa0from pole to image and u is the\xa0distance\xa0from pole to object. Here we use sign conventions.\xa0Focal length\xa0is\xa0positive\xa0for a\xa0concave mirror\xa0and\xa0negative\xa0for\xa0convex mirror. It is neither positive nor negative

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