The position, relative size and nature of the image formed by a concave lens for an object placed at infinity are respectively

A concave lens, also known as a diverging lens, always forms a virtual, erect, and diminished image regardless of the object's position [1]. When an object is placed at infinity, the incident rays are parallel to the principal axis. After refraction, these rays diverge and appear to meet at the principal focus (F1) on the same side as the object. Consequently, the image is formed at the focus, is highly diminished (point-sized), and is virtual and erect in nature. Unlike convex lenses, which can form real images, concave lenses only produce virtual images because the refracted rays never actually intersect [1]. Therefore, for an object at infinity, the specific properties are: at focus, diminished, and virtual.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 9: Light – Reflection and Refraction > Solution > p. 156