# The focal length f is related to the radius of curvature r of the spherical convex mirror by -

Question:

The focal length $\mathrm{f}$ is related to the radius of curvature $\mathrm{r}$ of the spherical convex mirror by -

1. $f=r$

2. $f=-\frac{1}{2} r$

3. $\mathrm{f}=+\frac{1}{2} \mathrm{r}$

4. $f=-r$

Correct Option: , 3

Solution:

So, $\frac{R}{2}=f$

$F=+\frac{1}{2} R$