Concave/converging mirror:
* produces a virtual image when object distance(u) exceeds its focal length(f).
1f=1u+1v\frac{1}{f} = \frac{1}{u} + \frac{1}{v}f1=u1+v1
1v=1f−1u\frac{1}{v} = \frac{1}{f} - \frac{1}{u}v1=f1−u1
1v=−130\frac{1}{v} = \frac{-1}{30}v1=30−1
Note that the negative sign only shows the placement of the image. It does not affect the magnification.
