Summarize convex-lens image formation for objects beyond 2F, at 2F, between F and 2F, and within F.

Solution & explanation

Beyond 2F gives a real inverted diminished image between F and 2F. At 2F the real inverted image is equal size at 2F. Between F and 2F gives a real inverted enlarged image beyond 2F. Inside F gives an upright enlarged virtual image on the object side; at F the ideal emerging rays are parallel.