Diverging lenses

We were taught that there are basically two types of lenses, namely converging and diverging lenses(concave lenses/negative lenses). My impression was that diverging lenses was the one that was oddly-looking. But we will only be taught the principles of converging lenses this time. As you know, I always like to learn out of the box. So I just want to seek out some differences between the two types of lenses. So as mentioned, diverging lenses are thicker at their edges and thinner at the middle, totally contrary to converging lenses. The 3 principle rays forming an image from a diverging lens also looks just opposite to those of converging lenses, and as they are rather hard to define here, I have placed their images here. Just like the converging lenses, the point at which all the 3 rays converge would be the image point, just that they are being traced back. However, they are simply imaginary rays drawn backwards of the lens to find the point. The true refracted rays of the lens never meets. Thus, a virtual image is formed behind the lenses, as the it will appear as though light were coming from the image point. It is therefore conclusive that all images seen through a diverging lens will appear upright, diminished and virtual. I think this can better help me remember the properties of the converging lenses too, so its quite worthwhile.

Blueprint for this topic(Lenses):
-Remember the six different types of principle images formed by converging lenses and their properties

-Remember the 3 principle rays of a converging lens image

All about light.....

After a month's break, it was always tiring to come back to school. Heard that we would continue learning light , and that would be about optics and lenses. The topic was indeed rather stale for us, giving that we had been doing it last term. Nonetheless, I just went online, read my textbooks and glanced through some basic content we would most probably covering to give me a better understanding.  I basically understood most of the things, but I think except one. I came across the thin-lens equation in Gaussian form, which is the 1/u+1/v=1/f equation, and I had seen it before in some Physics reference books. Curious, I went to read more about it, and it literally gave me a headache with those sophisticated scientific terms that I had no single idea of. Hope we won't be learning something like that......