Question: The focal length $\mathrm{f}$ is related to the radius of curvature $\mathrm{r}$ of the spherical convex mirror by -
$f=r$
$f=-\frac{1}{2} r$
$\mathrm{f}=+\frac{1}{2} \mathrm{r}$
$f=-r$
Correct Option: , 3
Solution:
So, $\frac{R}{2}=f$
$F=+\frac{1}{2} R$
