concave

seanandkate

Well-Known Member
Fight Leukemia
Joined
Aug 29, 2008
Location
Stouffville, Ontario
Lenses are classified by the curvature of the two optical surfaces. Also called a "diverging lens" because it diverges parallel rays outward. A convex lens pinches inward toward the centre of the lens. When this curve occurs on both sides of a lens it is called "biconcave" and when it occurs on a single side it is called "plano-concave".


Picture from www.shokabo.co.jp