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Lenses are mainly light-controlling elements, used basically for image formation with visible light and infrared light. A lens is an optical device which is literally a piece of transparent material, such as glass or plastic or fiber, that refracts or bends the rays of light that pass through the lens in a definite way. Most lenses are made of glass or plastic. Usually, lenses have one or two curved surfaces. Lenses are of different types, orginallyConvex and Concave lenses are widely used in the world for various uses. CONVEX LENSA Convex Lens is thicker in the center, causing rays of light which are originally parallel to meet at a single point called the focal point. A convex lens bends light rays toward each other when the light passes through the lens. A convex lens magnifies the object makes objects larger and closer. The glass of Convex lenses is curved inward. Convex lenses are used to correct Long-Sightedness. CONCAVE LENSA Concave Lens is thinner in the middle, causing the rays of light to appear to originate from a single point. A concave lens spreads out light rays when light passes through the lens. They cannot form an image on a screen. Concave lenses make objects look smaller and closer than the original. The glasses of Concave lenses are curved outward. Concave lenses are used to correct Short- sightedness. COMPARISON TABLE
CONCLUSIONConcave lenses are often used together with convex lenses these lenses are called as “Concave – Convex lens”. Concave lens, when combined with the convex lenses, give sharper images.Most eyeglass lenses have combinations of concave and convex. In modern world eyeglasses allow millions of people to see and read comfortably. Cameras, telescopes, and microscopes which use different lens helping us to see the world in a better way.
Concave and Convex are two types of lenses that possess variation in physical shape as well as their properties. The crucial difference between concave and convex lens is that a concave lens diverges the light rays that incident on its surface. On the contrary, a convex lens has the ability to converge the light rays passing through it. These two lenses display distinct properties and have different applications according to the shape of the lens. Let us first understand: What is a Lens? A lens is known as an optical instrument that either converges or diverges the light beam that incidents on its surface by using the principle of refraction. It is actually a piece of glass in an appropriate shape which is responsible for converging or diverging the light rays. It is moulded in a way to refract the light rays in order to form an image. The power of the lens is defined in terms of a measure of convergence or divergence, the lens introduces to the light rays that incident on it. Here we will see how a concave lens is different from a convex. Content: Concave Lens Vs Convex Lens
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Definition of Concave lensA concave lens is a type of optical lens where the surface of the glass is curved in an inward direction making the center thinner than the edges. Its outer surface somewhat resembles a cave. When a light ray falls on the surface of the lens then it bends the light rays passing parallel to its principal axis. Basically, the curvature of the lens is responsible for the direction in which the ray bents, the amount with which it bents, and the material of formation. In a concave lens, the center is quite thinner than the edges thus the curve is present in an inward direction. So, when the light rays pass through it then despite bending towards a single point, it disperses. Thus, concave lenses are diverging in nature. In the concave lens, the path of the rays is traversed behind the lens so as to get the focal point. As the rays diverge in the case of concave lenses thus, their focal length is negative. Definition of Convex lensA type of optical lens whose surface is bulged in an outward direction making the center thicker than the edges. We have already discussed that when light from an object incident on the surface of the lens then it gets bent. Also, the direction of bending depends on the curvature and material. So, as in the case of the convex lens as the center is thicker than the edges thus the ray of light passing through it gets bent in an inward direction towards a single point. Thereby giving rise to the convergence of light rays hence, called a converging lens. The single point towards which the rays bent is the focal point thus in the case of convex lenses, the focal point is present on the opposite side of the region from where the rays are falling. Thus, its focal length is positive.
ConclusionThus, the above discussion between a concave and a convex lens concludes that both have different physical shapes and generates a different form of images when light rays incident on it thus have different applications. |