Which of the following lenses has at least one plane surface?
a. double-convex lens
b. converging concavo-convex lens
c. double-concave lens
d. plano-convex lens
Plano-convex lenses are types of lenses that have one spherical surface and one flat surface.
These types of lenses are designed for infinite conjugate use or simple imaging in non-critical applications. The lenses are ideal for all-purpose focusing elements.
For example; they are ideal for beam expansion, light projection, or for expanding an optical system's focal length.
