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There are three types of concave lenses Fig. A diverging lens is called a concave lens. Fig. Concave or Diverging Lenses: These are thin in the middle and thick at the edges. Here we will discuss about the Concave and Convex Lenses only. Three types of concave lenses (a) Double Concave Lens: It has both the surfaces concave. Convex Lens. A convex lens is thicker in the middle and thinner at the edges. The characteristics of the image formed can be: The ray diagram in Figure shows the characteristics and position of the image formed by a concave lens. 3. 2. A concave lens is also called as a negative lens or a diverging lens. Convex or Converging Lenses: These are thick in the middle and thin at the edges. An optical lens is made of transparent material such as glass or clear plastic. A lens that is concave on both sides is called a double concave lens. There are mainly two types of lenses. There are two types of lenses, converging and diverging lenses. The following steps are used to draw a ray diagram for a convex lens. The image is on the same side of the lens and between the object and the lens. There are numerous uses of the concave lens, like in telescopes, cameras, lasers, glasses, binoculars, etc. 1. (b) Plano–Concave Lens: It has one surface plane and the other surface concave. It is thinner at the centre than at the edges. If the curvature radius of the two surfaces of this lens is equal, then it is called equi concave lens. A convex lens is also known as a “biconvex lens” because of two spherical surfaces bulging outwards. 2. Concave Lens. Concave Lens Uses. 5. Figure shows the three key rays used in the construction of a ray diagram for a concave lens. Definition: A piece of a transparent medium bounded by at least one spherical surface, is called a spherical lens. So, lenses formed by binding two spherical surfaces bulging outward are known as convex lenses while the lenses formed by binding two spherical surfaces such that they are curved inward are known as concave lenses. As a convex lens forms different types of images depending on the position of object, similarly a concave lens also forms different types of images when the object is placed at 1. Types of concave lens. They are:- 1. 6. Three types of convex lenses (a) Double Convex Lens: It has both the surfaces convex. This is one of the basic difference between concave and convex lenses. 1. Diverging Meniscus. Concave lenses represent the type of lenses which are slender at the centre than at the borders. One or both surfaces usually have a spherical curve. Converging Meniscus. There are three types of concave lenses Fig. Figure shows the three key rays used in the construction of a ray diagram for a convex lens. 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