Concave/converging mirror:
* produces a virtual image when object distance(u) exceeds its focal length(f).
1f=1u+1v
1v=1f−1u115−110=2−330
1v=−130v = -30cm( virtual image) but m = vu=3010=3
Note that the negative sign only shows the placement of the image. It does not affect the magnification.