If you are told an image is real and you know it was made by a single optic (either a lens or a mirror), which of the following must be true?
The image distance is positive.
The image distance is negative.
The image is inverted.
The image is upright.
The image height is positive.
The image height is negative.
The magnification of the image is positive.
The magnification of the image is negative.
It was made by a converging optic.
It was made by a diverging optic.
The focal length of the optic is positive.
The focal length of the optic is negative.