Lens
Object located at a finite distance from the lens
Section titled “Object located at a finite distance from the lens”The object point A is to the left of F. B′ is located at the intersection of the rays emerging from the lens: the image is real.
The object point A is to the right of F. B′ is located at the intersection of the extensions of the rays emerging from the lens: the image is virtual.
Object located at infinity
Section titled “Object located at infinity”The image is real and located in the image focal plane.
- B at infinity
- A at infinity on the optical axis
