1

This question already has an answer here:

If the distance between the center of the lens and the film is called Focal length, does that mean the focal point of the camera lens is located on the film?

marked as duplicate by Michael C, chuqui, dpollitt, Hugo, MikeW Dec 16 '14 at 2:19

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.