The middle of a concave lens is thinner, while the borders are thicker.
When a parallel beam of light strikes the concave lens, it deflects the light rays outward, causing them to diverge from a point known as the focal point.
A concave lens is used to diverge light out before it enters the eye, allowing the light to focus further back.
A concave lens is also known as a diverging lens because of its diverging property.
An illustrative diagram of the concave lens is shown below.
Some examples are listed below:
Camera makers use concave and convex lens configurations to increase the photographic composition.
In flashlights, concave lenses are used to magnify the light produced by the source.
Myopia, also known as nearsightedness, is most commonly corrected with the help of concave lenses.
It is a diverging lens that is employed in door spy holes and optical devices such as telescopes, binoculars, etc.