I know this is a simple question, however, I have never been taught the practical side to Physics properly so here we go.
I know I can use the lens equation to find the image distance, but if I wanted to find the image distance experimentally, what do I do?
Real images can be projected onto screens, but how do you do this? Should I move the screen back and forth until a clear image of the object forms on the screen? This seems logical but would this just find the focal length as that is where the image is clearest, or is that just for distant objects? I have included a diagram of the sort of experiment I have in mind, though I am looking for a general method rather than a solution to the two specific scenarios given.