Is focal length positive or negative …

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Posted by Urmila Prajapat 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Focal length formula for mirror is 1/F=1/V+1/u, where V is the distance from pole to image and u is the distance from pole to object. Here we use sign conventions. Focal length is positive for a concave mirror and negative for convex mirror.
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