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

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

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

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