Definition of the word lens

The word "lens" originates from Latin, where it was known as "lens," which is derived from the Latin word "lenticula," meaning "little lentil." This refers to the fact that early lenses were often made of convex glass, resembling the shape of a lentil. The Latin word "lens" was first used in the 13th century to describe the curved glass or crystal used in eyeglasses. Over time, the term "lens" has evolved to encompass not only the physical device but also the concept of focus and refraction in optics. Today, lenses are used in a wide range of applications, from eyeglasses and cameras to surgical instruments and telescopes.