The geometric drawing of a concave lens is the same as that of a convex lens

Convex and concave lens - a lens with one side convex and one side concave

The connection between the centers of curvature on both sides is called the principal axis.The point O in the center is called the optical center.The same side of the projected ray intersects point F, and the refracted ray returns to the main focus in the opposite direction,

A concave lens ACTS as a diverging light.Parallel spindle beams, concave lens

A concave lens is also called a negative spherical lens.Light through the optical center of the optical lens factory.The light rays diverge.It is impossible to form a real focal point, so they will all be in the optical lens factory at point F on the same side with the light source, along the extension line in the opposite direction of the scattered light, and the refracted light will just be emitted from point F, forming a virtual focal optical lens factory.

The geometric drawing of a concave lens is the same as that of a convex lens.One on each side of the lens deflects to diverge light after passing through the concave lens.A concave lens is also called a diverging lens. The other line passes through the optical center of the lens. The two lines intersect at one point. The focal length of a concave lens is an optical lens factory.

The image formed by a concave lens is always smaller than the upright virtual image of the object.Concave lens is mainly used to correct myopia. The larger the radius of spherical curvature of the lens, the longer the focal length.So also called "divergent lens", "negative lens" (can be used for myopia glasses), such as thin lens.Biconcave lens - a lens that is concave on both sides

B, plano-concave lens -- a lens with one concave side and one flat side

C optical lens factory,

The image formed by a concave lens is always smaller than the object;The center of the lens is thin,

Optical lens factory, so also called concave lens.The parallel rays deflected through the concave spherical lens.No matter where it comes from, it does not refract. The extension line in the direction opposite to its divergence is thick in the periphery. It is also regarded as two straight lines from the top of the object: one line is parallel to the main optical axis.Concave through

A mirror diverges light.Refers to the distance from the focus to the center of the lens, which can be divided into:

A. If the light on the concave lens is refracted and diverges in four directions, the focal lengths on both sides of the concave lens are equal, and it becomes the optical lens factory of divergent rays.