A concave lens, also known as a diverging lens, is a type of optical lens that is thinner at the center than at the edges. It is characterized by its curved inward or concave shape on both sides. Concave lenses are designed to diverge or spread out light rays that pass through them. Concave lenses have various practical applications, including in corrective eyeglasses for people with myopia (nearsightedness), where the lens helps to spread out the incoming light rays to focus them correctly on the retina. They are also used in devices such as binoculars, telescopes, and cameras to adjust the size and orientation of the image. Their lenses are designed to diverge light rays and have a virtual focal point. They are commonly used in optics for specific purposes, and their ability to spread out light makes them a valuable tool in various optical instruments and vision correction.