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Plano-convex lenses are ideal for focusing parallel rays to one point. These lenses can be used in a variety of applications. They have proven focal lengths, and they have a near-optimal appearance for infinite and finite conjugate applications. Plano-convex lenses can converge the collimated beam on the back focus, and can also turn a point light source into a collimated beam. The coated lens is also widely used in visible light and near-infrared fields.
Plano-convex lenses are usually used to focus parallel light. The front and rear surfaces of the plano-convex lens are asymmetric, so it can effectively reduce spherical aberration, especially in applications where the object image distance is not equal. The best application is to place an object at infinity (that is, as parallel light incident) and image in the focal plane. At this time, the object-image conjugate ratio (ie, object distance/image distance) is infinite.
A plano-convex lens has a convex surface and a flat surface, and has a positive focal length. It is usually used for related applications such as reducing the beam, reducing the focal length, or enlarging the image. In order to reduce spherical aberration, when the plano-convex lens is used to collimate the beam, the beam should be incident on the curved surface of the lens; when used for the collimation of the point light source, the beam should be incident on the plane.
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