ICSE Class 10: Image Formation in Lens Videos | Refraction of Light

The image formed by the convex lens when an object is placed between the focus and the optical centre is virtual, erect and enlarged.

A convex lens is not used in a spyhole.

For a wide angle view, a concave lens is used in a spyhole.

When an image formed by a concave lens is highly diminished, the object is placed at infinity.