What is a plano-convex lens

Plano-convex lenses, convex on one side and flat on the other, have a positive focal length and are commonly used for related applications such as reducing the beam, reducing the focal length, or enlarging an image.In order to reduce spherical aberration, when a plano-convex lens is used for collimating beam focusing, the beam should be incident on the surface of the lens. When used for point source collimation, the beam is incident on a plane.Plano-convex lenses have a positive focal length and are often used in applications such as imaging or beam collimation, while coated lenses are also widely used in visible and near-infrared applications.

Working principle

Plano-convex lenses focus parallel rays of light into a single point, which is the focal point of the lens.It is characterized by a positive focal length, one of which is flat and the other is convex.When used, the convex surface is usually oriented towards the incident light, because the light incident on both sides of the flat convex lens is slightly different in the refractive index, so the focal length of both sides is also different, in order to reduce the spherical difference, the beam should be as far as possible from the curved surface incident.   Plano-convex lenses are often used to aim and focus monochromatic light sources, converge parallel light, or convert divergent point light sources into parallel light.The asymmetry of plano-convex lenses can reduce spherical aberrations in applications where the image and the object and the distance between the lenses are not equal.Typically, a parallel beam (or distant source) is incident from a convex plane to minimize the occurrence of spherical aberrations, and the beam emitted from the plane side is collected.Plano-convex lenses are used to focus optical systems and collimate diffused beams. Maximum sharp focus can be achieved when the curved part of the lens is facing the object.Plano-convex lenses have positive focal length and direction and play a key role in determining image quality.

Application field

Plano-convex lenses, often used in imaging or beam collimation applications, coated lenses are also widely used in visible and near-infrared applications. Plano-convex lenses play an important role in astronomy, military, transportation, medicine, art and other fields.