A concave lens always forms ___________ image of an object.

The structure of the lens affects the pictures produced by convex and concave lenses. The concave has a few distinctive characteristics. Finding the qualities of the object construction will be made easier with knowledge of the attributes.

A concave lens is also known as a diverging lens. And it always forms a virtual, erect, and diminished image as shown in the figure below.

A diverging lens is another name for a concave lens. This is due to the fact that it has a surface that curves inward. Light rays that are subsequently refracted through a concave lens spread out. Myopia, another name for short-sightedness, is treated with a concave lens.
Recall that a virtual picture at a point can only be created by a concave mirror or converging lens if the image is situated outside of the focus point. We refer to the point that is farther away than one focal length as the focal point. The resulting image will be vertical and smaller in size.

Hence, the correct answer is option D.