SDN Members don't see this ad. (About Ads) I am quite confused how to do this, because of sign conventions. When an object s is on the left side of the lens, it is designated as positive. When an image s' is REAL, it is designated as positive. this would bring our magnification to m=s'/s, which is a positive value. But for converging lens, m should be a negative number....... m=h'/h Because h' is inverted, it should be a negative value... making m a negative value as well. But that would make our first equation impossible. What's up with this?