converging lenses

Thicker in the center than on the edges; they cause parallel light rays emanating from an object to converge onto the same point.

plano-convex lens

Lens with one flat side and one convex side (bulging outward).

positive meniscus

Lens where the concave side (curving inward) is less pronounced than the convex side (bulging outward).

biconvex lens

Lens with both faces bulging outward.

convex lens

Lens with one side bulging outward; the greater the bulge, the more the light rays converge.