It is used in spectacles to correct the vision. Concave lenses. A lens is a tool used to bring light to a fixed focal point. As of 2010, mirrors and lenses are so prevalent that most people use them every day, regardless of whether or not they consciously perceive the use… That's why concave lenses are sometimes called diverging lenses. Mirrors and lenses both have the ability to reflect or refract light. Concave lenses are used in flashlights to widen the beam produced by the bulb. Convex lenses are used in things like telescopes and binoculars to bring distant light rays to a focus in your eyes. It cures defects called myopia (near sightedness) where patients can't see objects far away They are used in camera to focus on a single object, Hence we get a clearer picture It is used in Flashlights. In a film camera, the lens sends the light to the film strip, while in a digital camera (like DSLRs or mirrorless cameras), the lens directs light to a digital sensor.Camera lenses are made up of a series of glass plates that are convex (curved outward) or concave (curved inward). This property has put mirrors and lenses in use for centuries. A concave lens is exactly the opposite with the outer surfaces curving inward, so it makes parallel light rays curve outward or diverge.