For an object at infinity ($u = -\infty$), the image is formed at the principal focus ($v = -f$).

A concave lens has negative focal length ($f < 0$) and negative optical power ($P < 0$).

The magnification produced by a concave lens when $u = -\infty$ is $m \to 0$, indicating a point-sized image.

Produces a wider field of view, making it ideal for wide-angle viewports and vision correction.

Always produces upright (erect) images without risk of image inversion.

Cannot project images onto a screen because the formed images are always virtual.

Always reduces the size of the image, making objects appear smaller than they are.

Correction of Myopia (short-sightedness) in eyeglasses.

Peepholes in doors (spyholes) to provide a wide-angle view of outside visitors.

Lasers and flashlights to spread or diverge the light beam.

Option A (Real, inverted, same size) occurs in a convex lens when the object is at $2F_1$.

Option C (Virtual, erect, larger) occurs in a convex lens when the object is between the focus $F_1$ and optical center $O$.

Option D (Real, erect, point sized) is incorrect because real images formed by single spherical lenses are always inverted, not erect.