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The images formed by a lens can be:

• upright or inverted (upside down compared to the object);
• enlarged or diminished (smaller than the object);
• real or virtual.

A real image is an image that can be projected onto a screen.

Rays of light actually pass through the image.

A virtual image cannot be projected onto a screen.

It appears to come from behind the lens and can only be seen by looking through the lens.

Rays of light appear to come from a virtual image, rather than pass through it.