This might come across as a very rudimentary question. My fundamentals of Optics are weak. In the optics chapter of my physics text book I saw diagrams each depicting an object on the left and a lens -- typically convex -- in the middle and an inverted image forming on the right side.
Let's say I want to perform this experiment, how can I do it?
I have always seen such lenses as parts of complex systems like cameras. Do I get such stand-alone lenses from the market off the shelf? And if I keep a candle on the left side, on what screen do I capture the image on the right side? A vertical plate, paper, or the like won't show an image. (Why is this so?)