(c) Concavo–Convex Lens: It has one surface concave and the other surface convex. Types of concave lens. Plano-Convex Lens. 2. One or both surfaces usually have a spherical curve. It is thicker at the centre than at the edges. Fig. 1. 2. 4. Fig. A lens that is concave on both sides is called a double concave lens. The following steps are used to draw a ray diagram for a convex lens. There are numerous uses of the concave lens, like in telescopes, cameras, lasers, glasses, binoculars, etc. (c) Convexo–Concave Lens: It has one surface convex and the other surface concave. Definition: A piece of a transparent medium bounded by at least one spherical surface, is called a spherical lens. There are mainly two types of lenses. There are two types of lenses, converging and diverging lenses. There are three types of concave lenses depending on the shape of the surface. A convex lens is also known as a “biconvex lens” because of two spherical surfaces bulging outwards. Concave or Diverging Lenses: These are thin in the middle and thick at the edges. Between infinity and optical centre. 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. Lenses are of two kinds: Convex Lenses and Concave Lenses. A concave lens is also called as a negative lens or a diverging lens. Converging Meniscus. 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. 1. Convex Lens. Concave or Diverging Lenses: These are thin in the middle and thick at the edges. Double concave lens. Figure shows the three key rays used in the construction of a ray diagram for a convex lens. (b) Plano–Concave Lens: It has one surface plane and the other surface concave. 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. Formation of image by a concave lens when the object is placed at infinity If the curvature radius of the two surfaces of this lens is equal, then it is called equi concave lens. Images Formed By Lenses; Types of Images Formed by Lenses. However, with a concave lens, we always get virtual, upright, and diminished images (regardless of the distance of the object from the lens). Convex Lenses. The characteristics and position of the image formed changes with the position of the object or distance of the object from the lens. (b) Plano–Convex Lens: It has one surface plane and the other surface convex. The nature of the image formed by a convex lens varies as the distance of the object from the lens changes. An optical lens is made of transparent material such as glass or clear plastic. Filed Under: Physics Tagged With: concave lenses, Convex lenses, Refraction, Spherical Lens, Types Of Spherical Lens, ICSE Previous Year Question Papers Class 10, Lens Formula & Magnification – Lens Power, Image Formation By Concave And Convex Lenses, To Construct Optical Devices Using Lenses, characteristics of the image formed by a lens, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, Why Southwest Essay | Essay on Why Southwest for Students and Children in English, Border Wall Essay | Essay on Border Wall for Students and Children in English, Suicide Essay | Essay on Suicide for Students and Children in English, Heart of Darkness Essay | Essay on Heart of Darkness for Students and Children in English, Why i Want to go to College Essay | Essay on Why i Want to go to College for Students and Children in English, Plus Two Business Studies Chapter Wise Previous Questions Chapter 12 Consumer Protection, Emotional Intelligence Essay | Essay on Emotional Intelligence for Students and Children in English, Plus Two Business Studies Chapter Wise Previous Questions Chapter 4 Planning, Plus Two Business Studies Chapter Wise Previous Questions Chapter 13 Entrepreneurial Development, Fear Essay | Essay on Fear for Students and Children in English, Plus Two Business Studies Chapter Wise Previous Questions Chapter 3 Business Environment. Concave Lens Uses. A converging lens is called a convex lens. 3. (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 concave lens. There are three types of concave lenses Fig. Telescope and Binoculars Spectacles Lasers Cameras Flashlights Peepholes. Plano-concave Lens. Here we will discuss about the Concave and Convex Lenses only. Concave Lens. A diverging lens is called a concave lens. It is thinner at the centre than at the edges. Three types of concave lenses (a) Double Concave Lens: It has both the surfaces concave. In general, there are two types of spherical lenses. Diverging Meniscus. They are:- 1. 5. 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. 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. Three types of concave lenses (a) Double Concave Lens: It has both the surfaces concave. The image is on the same side of the lens and between the object and the lens. 6. Concave lenses represent the type of lenses which are slender at the centre than at the borders. Convex or Converging Lenses: These are thick in the middle and thin at the edges. Diagrammatic representation of images formed by lenses. 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. At infinity 2. There are three types of concave lenses Fig. A convex lens is thicker in the middle and thinner at the edges.