(n.) A piece of glass or other transparent substance, ground with two opposite regular surfaces, either both curved or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical or of some other figure.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). lens. Retrieved September 24, 2026, from http://smartdefine.org/lens/definitions/2027365 |
| Chicago | Webster's. 2011. "lens" http://smartdefine.org/lens/definitions/2027365 (accessed September 24, 2026). |
| Harvard | Webster's 2011, lens, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/lens/definitions/2027365>. |
| MLA | Webster's. "lens" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/lens/definitions/2027365> |