Write the relationship between object distance $(u)$,image distance $(v)$,and focal length $(f)$ for a spherical mirror.

• A
  $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$
• B
  $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
• C
  $\frac{1}{u} + \frac{1}{v} = \frac{1}{f}$
• D
  $\frac{1}{f} + \frac{1}{v} = \frac{1}{u}$