Hi all, I've been reading about biconvex lenses, drawing ray diagrams and real/virtual images. I'm now trying to translate this into how an image is formed in a compound infinity optics microscope. And this has raised some questions: -In an infinity optical system the object is placed at a distance (F) the focal point of the lens on the object side and therefore the lens converts the refracting rays to parallel ray bundles on the image side? -Because the object is always placed at the focal point an image is not formed by the objective? -The role of the tube lens is to converge the parallel rays travelling in line with the principal axis? -The point at which the rays converge on passing through the tube lens is the focal point of the tube lens on the image side, the intermediate image plane? -If the light travels in parallel lines between the objective and tube lens, is the light therefore collimated? And the objective is basically a collimator? Really i'm just wondering if my understanding on the above is correct? Ray diagrams tend to over-simplify things. Thanks for the help!