What do we mean by a spherical lens?
1、 Basic concepts
Definition: A mirror whose reflective surface is a part of a spherical surface is called a spherical mirror (part of the spherical shell – the spherical crown).
Category: Spherical lenses are divided into convex mirrors and concave mirrors.
1. Concave mirror: A spherical mirror that uses the inner side of a spherical surface as the reflecting surface is called a concave mirror.
2. Convex mirror: A spherical mirror that uses the inner side of a spherical surface as the reflecting surface is called a convex mirror.
other
1. Vertex: The center point O of the mirror surface is called the vertex of the mirror.
2. Center: The center C of the spherical surface is called the mirror center.
3. Spindle: A dotted line connecting vertex O to the center of the mirror surface.
4. Focus: A paraxial light ray parallel to the main axis strikes the spherical surface, and the reflected light converges at a point on the main axis. This point is called focus, and is represented by the letter F.
5. Focal length: The distance from the focal point to the vertex is called focal length, which is represented by the letter f, that is, the focal length of a concave mirror is equal to half the radius of the spherical surface.
6. Optical characteristics of concave mirrors:
(1) The reflection phenomenon on a concave mirror obeys the reflection law of light.
(2) The light parallel to the main axis is reflected by a concave mirror, and the reflected light converges at the focal point. The focus of a concave mirror is the convergence point of actual light, so it is a real focus.
(3) Concave mirrors converge on light. The smaller the focal length, the greater the convergence ability.
(4) Four special rays: rays parallel to the main axis are reflected by a concave mirror and converge at the focal point; The incident light passing through the focal point is reflected and parallel to the main axis; The incident light passing through the center of the spherical surface returns along the original path; The light rays incident from a vertex are symmetrical about the principal axis of their reflected light.
The above is an introduction to spherical mirrors shared by Hanzhong Borisun Optics Co., Ltd. Welcome to learn from each other. It is a professional manufacturer of optical components and optical abrasives for various optical instruments.
