420. Why is it that images are right side up (instead of upside-down) when looking through a magnifying glass?
In forming a real image, a camera lens behaves symmetrically, taking light reaching it from above its central axis and projecting that light onto a spot below its central axis. But in forming a virtual image, a magnifying lens merely redirects the light subtly to have it appear to come from a point nearer or farther than the original object. You still see the object as it was (right-side up) but moved toward you or away from you.