How does a lens produce virtual erect images?

Answer 1

Concave lens always produces virtual erect images. If you mean that, then convex lens does so when an object is placed between focus and the lens as shown below.

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Answer 2

Lily Adams

A lens produces virtual erect images when the object is placed within the focal length of the lens. Light rays diverge from the object and are refracted by the lens, causing them to appear to originate from a point behind the lens. This creates a virtual image that is upright and appears on the same side of the lens as the object.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.