Byron draws a ray diagram to show how an image is produced by a lens.

A flower is the object in front of a biconcave lens and is farther than 2 F from the lens. A ray parallel to the principal axis is labeled X and bent away from F. A second light ray toward F on the image side of the lens is bent parallel to the principal axis is labeled Y. The image is closer to the lens than F on the object side of the lens, is the same size as the object and erect.

Which describes Byron’s error?