Question
State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).

Answer

$\frac{1}{\text{image distance}}+\frac{1}{\text{object distance}}=\frac{1}{\text{focal lenght}}$Or
$\frac{1}{\text{v}}+\frac{1}{\text{u}}=\frac{1}{\text{f}}$ v = distance of image from mirror. u = distance of object from mirror. f = focal length of mirror.

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