There are three types of concave lenses Fig. (b) Plano–Concave Lens: It has one surface plane and the other surface concave. Figure shows the three key rays used in the construction of a ray diagram for a convex lens. The characteristics and position of the image formed changes with the position of the object or distance of the object from the lens. However, with a concave lens, we always get virtual, upright, and diminished images (regardless of the distance of the object from the lens). 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. A convex lens is thicker in the middle and thinner at the edges. Diverging Meniscus. The nature of the image formed by a convex lens varies as the distance of the object from the lens changes. Double concave lens. A diverging lens is called a concave lens. Concave Lens. 5. 4. The shape of a concave lense is round inward that bends the beams outward, causing divergence of the rays of light falling on it, so it is known as a diverging lens. 2. Fig. A lens that is concave on both sides is called a double concave lens. Telescope and Binoculars Spectacles Lasers Cameras Flashlights Peepholes. Diagrammatic representation of images formed by lenses. Concave and Convex Lenses - The type of lenses which converge the light beam coming from the source to one point on the other side to form an image is called as a convex lens, while the concave lens which is thinner at the centre and gets thicker as we move towards the edges is called as Concave lens. Concave or Diverging Lenses: These are thin in the middle and thick at the edges. Three types of concave lenses (a) Double Concave Lens: It has both the surfaces concave. 3. 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. (c) Convexo–Concave Lens: It has one surface convex and the other surface concave. Plano-Convex Lens. Three types of concave lenses (a) Double Concave Lens: It has both the surfaces concave. 2. An optical lens is made of transparent material such as glass or clear plastic. At infinity 2. (c) Concavo–Convex Lens: It has one surface concave and the other surface convex. It is thicker at the centre than at the edges. Concave lenses represent the type of lenses which are slender at the centre than at the borders. Lenses are of two kinds: Convex Lenses and Concave Lenses. 1. Fig. Images Formed By Lenses; Types of Images Formed by Lenses. 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. It is thinner at the centre than at the edges. Figure shows the three key rays used in the construction of a ray diagram for a concave lens. Convex Lenses. They are:- 1. 1. Types of concave lens. There are numerous uses of the concave lens, like in telescopes, cameras, lasers, glasses, binoculars, etc. Between infinity and optical centre. Concave or Diverging Lenses: These are thin in the middle and thick at the edges. A convex lens is also known as a “biconvex lens” because of two spherical surfaces bulging outwards. Three types of convex lenses (a) Double Convex Lens: It has both the surfaces convex. A concave lens is also called as a negative lens or a diverging lens. 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In general, there are two types of spherical lenses. There are two types of lenses, converging and diverging lenses. This is one of the basic difference between concave and convex lenses. A converging lens is called a convex lens. Convex Lens. Here we will discuss about the Concave and Convex Lenses only. If the curvature radius of the two surfaces of this lens is equal, then it is called equi concave lens. One or both surfaces usually have a spherical curve.
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