The two types of concave lenses — biconcave and plano-concave — are negative. Meniscus lenses — a third broad type also referred to as convex-concave — can be either positive or negative, depending on ...

In his workshop in Padua, Italy, he discovered that plano-convex and plano-concave lenses worked best—that is, lenses with a plane on one side and curved surfaces on the other. Then, drawing on ...

Convex and concave lenses can both be used to correct defects of vision. The most commonly occurring defects of vision are ‘short sightedness’ and ‘long sightedness’. People who are ...

Meniscus lenses have one convex and one concave surface with each surface having its own radius or curvature. Applications include lasers and cameras. There are two types of meniscus lenses. Positive ...