Formation of a virtual image by a converging lens:
The object must be between the lens and its principal focus. The image is formed on the same side of the lens as the object.
The image is virtual, upright and larger than the object. It can only be seen by looking through the lens. This is how a magnifying glass works.
Formation of a virtual image by a diverging lens:
The image formed by a diverging lens is always virtual, upright and smaller than the object.
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