Lesson: Chapter 5 — Optics

Images formed by a convex lens 6 of 6

All the cases together

Table 5.2 puts every object position for a bi-convex lens side by side.

Object position	Image position	Real or virtual	Upright or inverted	Size
Less than f	Same side as the object, further away	Virtual	Upright	Larger than the object
At f	At infinity	—	—	Infinitely large
Between f and 2f	Beyond 2f, other side	Real	Inverted	Larger than the object
At 2f	At 2f, other side	Real	Inverted	Same size as the object
Beyond 2f	Between f and 2f, other side	Real	Inverted	Smaller than the object
Very far away	At the focus, other side	Real	Inverted	Much smaller than the object

After Table 5.2 of the textbook.

A convex lens behaves like a concave mirror: a virtual, upright, magnified image only when the object is inside the focal length, and a real, inverted image everywhere else — the difference is that a lens forms its real image on the other side.