Question

mirror formulae 1/f=1/v+
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Answer 1

$\bold{AnsweR:}$

Correct mirror formulae = $\bold{\frac{1}{f}=\frac{1}{v}+\frac{1}{u} }$

Focal length (f) of a mirror does not depend upon u or v. It cannot be changed by moving the object towards or away from the mirror. This is because, when we change object distance (u), the image distance (v) changes, keeping (f) constant.

In fact, focal length of mirror is half the radius of cur-vatur (R) of the mirror, i.e., f=R/2. Focal length will change with change in radius of curvature of the mirror.