Winner of the standing ovation award for best powerpoint templates from presentations magazine. If you take a football or a rugby ball and place it as if youre about to kick it, youll see that it has a convex shapeits ends are pointy, and it has a thick middle. Uses of the concave mirror and the convex mirror in our daily life. It is this type of lens that is most commonly used in corrective lenses. It curves outward, and its middle is thicker than its edges. Geometric optics intuition with mirrors and lenses concave convex diverging converging doc physics. Lets look at the four combinations of virtualreal convexconcave lenses for a single lens.
Find powerpoint presentations and slides using the power of, find free presentations research about convex lens and concave lens ppt. Diverging lenses bend parallel rays away from one another. The very simplest camera has no lens at all and uses a pinhole to focus the light. Convex mirrors diverging and concave lenses diverging can be memorized with suv smaller, upright, virtual concave mirrors converging and convex lenses converging have 5 different possibilities. Marys design proposal included a lot of convex lines. Convex lenses are also known as converging lens since the rays converge after falling on the convex lens while the concave lenses are known as diverging lenses as the rays diverge after falling on the concave lens. Theres a cave in concave, and caves are inward curvatures. Instead, a microscope consists of an objective and an eyepiece. View and download powerpoint presentations on concave and convex lens ppt. Fill in all the gaps by choosing the correct answer from the dropdown menu each word is to be selected only once then press the check button to see your result. It is important to follow these sign conventions for lenses. These lenses are used in the manufacture of corrective lenses. These lenses focus the rays of light to produce a apart centre concave converging eye focal focus inwards parallel real transparent virtual image that can be projected onto a screen.
Convex lenses are therefore used in instruments like cameras, telescopes, etc. A lens is a polished piece of glass or transparent plastic with curved surfaces. Ppt mirrors and lenses powerpoint presentation free to. The concave lens is known as the diverging lens because it diverges the rays after they pass through it, the image formed by the concave lens is a virtual image because it can not be received on a screen. A lens can be defined as a transparent material like a glass that has either an open curved surface or one flat surface or two curved surfaces. A lens with two concave surfaces is biconcave or just concave. Convexoconcave lens article about convexoconcave lens. But the nature of the image produced by a these lens depends upon the position of the object. A spoon is a kind of a curved mirror with both concave and convex surfaces.
Convex lens uses, examples, definition, ray diagram, formula. The lentil plant also gives its name to a geometric figure some scholars argue that the archeological evidence indicates that there was widespread use of lenses in antiquity, spanning several millennia. Moving up one step from there, a camera with a single element lens has a convex lens. It will give a virtual upright image if the object is within the focal length. Convex lens refers to the lens which merges the light rays at a particular point, that travels through it. For different positions of the object a convex lens forms images of varying sizes and nature at different locations.
Continue in the same way with concave lens to get the final answer as 3. Convex lenses are converging lenses, and concave lenses are diverging lenses. View and download powerpoint presentations on convex lens and concave lens ppt. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. Quiz if an object is 12 cm away from a convex lens of focal length 4 cm where will the image be.
Basic types of lenses convex lens concave lens type of image convex lens. Vision problems and contact solutions contact lenses. Toric contact lenses are made from the same materials as spherical lenses, but they have different angled curvatures to correct vision specifically for each individual. Curved mirrors concave and convex linkedin slideshare. F optical axislight rays that come in parallel to the optical axis still diverge from the focal point. A lens with one convex and one concave side is convexconcave or meniscus. Image formation by concave and convex lenses a plus topper. Sep 26, 2015 the concave lens is known as the diverging lens because it diverges the rays after they pass through it, the image formed by the concave lens is a virtual image because it can not be received on a screen.
Examples are the double concave lens both surfaces curved inward, the planoconcave one surface flat, the other concave, and the convexoconcave one surface convex, the other concave. Concave and convex lenses image formation curvature. Simulation of image formation in concave and convex lenses. Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses. Convex concave convex lenses bending toward the normal on a convex surface brings light rays together concave lenses bending. Optics became part of the bedrock of physics in 1611, kepler improved on galileos telescope by replacing its concave eyepiece with a convex one. Difference between concave lens and convex lens science. Difference between convex and concave lens convex vs. Object is past r between r and f on the other side inverted real object at r.
Move the point named focus to the right side of the lens to change to a concave lens. Types of the convex lens the lens which causes incident parallel rays to diverge at a point is known as a convex or converging lens. Lensesthere are 2 basic types of lenses a converging lens convex a diverging lens concave takes light takes light rays and bring rays and spreads them outward. Two types of lens diverging lens or concave lens converging lens or convex lens. Displaying powerpoint presentation on convex and concave lenses available to view or download. A convex lens is a converging lens when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus the distance between the principal focus and the centre of the lens is called the focal length.
Apr 11, 2020 lenses of many different types are used in optical devices such as cameras, eyeglasses, microscopes, telescopes, and projectors. They also enable millions of people to see clearly and read comfortably. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. Convex and concave lenses lenses and ray diagrams ocr. Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer. A convex lens is a type of spherical lens that converges the ray of light coming from the object. What does this tell you about the relationship between the focal lengths of these two lenses.
When light passes through concave lenses always bend away from each other toward the edges of the lens. This lens is thick at the center but thin at the edges. Level 5 explain how a camera lens works level 6 relate the shape of a lens to the type of glasses needed for long and shortsightedness. Move the tip of the object arrow to move the object. Jet printing of convex and concave polymer microlenses osa. Convex and concave lenses purpose in this experiment, you will explore the difference between convex and concave lenses and determine their focal lengths. Demonstration of the optics of thin convex and concave. Lenses lenses are made of transparentmaterials, like glass or plastic. So remember, concave means it opens inward, like a cave. Move the point named focus to change the focal length.
Convex lenses cause light to come together converge to a focal point. Finding a mnemonic device for concave is easy enough. Microscopes have a convex lens and a concave mirror and a flat mirror to magnify small images on a slide. This powerpoint introduces concave and convex lenses, and also goes through related concepts such as focal points, real virtual images, and the anatomy of the eye. Dec 18, 2010 a lens with one convex and one concave side is convex concave or meniscus. Objects placed at distances beyond 2 f would form clear images on the screen inside the cameras.
Powerpoint ppt presentation free to view light refraction and lenses concave lenses in this picture the concave lens forms an image that is smaller. It includes notes, videos, questions, vocabulary and set homework. The eye and sight contrast ways in which light rays are bend by concave and convex lenses. Experiments involve deciding what type od lenses pupils are given and calculating focal length.
A lens changes the direction of light waves by refraction. Properties of the formed images by convex lens and concave. There are two kind of a curved mirror, the concave and the convex mirrors. Microscope objectives and eyepieces themselves typically have anywhere from 310 lenses, including biconcave, biconvex, and meniscus lenses. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Of the two types of lenses convex and concave, the concave lenses are used less frequently. Concave lenses are thinner in the middle than at the edges. Shows definitions, light refracting, and objects that contain the lenses. In this article, we will learn about image formation by concave and convex lenses. In 1604, johannes kepler, the great german mathematician, astronomer and inventor, published optics, an astonishing treatise that covered the nature and action of light, as well as the mechanics of sight.
Find powerpoint presentations and slides using the power of, find free presentations research about concave and convex lens ppt. For an illustrated example of how images are formed with a. Presentation powerpoint file 346 kb 10 pages product description. Arial calibri default design mirrors slide 2 plane mirror type of image spherical curved mirrors concave mirrorconverging concave mirror converging mirror summary for concave mirror mirror equation magnification sign convention convex mirror diverging convex mirror diverging slide 15 summary for convex mirror simulation problem. Concave lenses cause light rays to spread out diverge. Convexoconcave lens article about convexoconcave lens by. Ppt convex and concave lenses powerpoint presentation. There are three types of convex lenses plano convex lens concavo convex lens doubleconvex lens.
A basic description of the differences between convex and concave lenses. For magnification, calculate the magnification of the first image. Most devices that control light have one or more lenses in them some use only mirrors, which can do most of the same things that lenses can do. Oct 27, 2012 power point uses slides from resources on tes and the worksheets are from btec collins resources. The university of virginias biology department notes that refracting telescopes use two convex lenses and reflecting telescopes use convex and concave lenses and a flat mirror to magnify 5. Convex lens and concave lens are two basic types of lenses. Light ray rules for convex lens and concave lens are discussed.
May 26, 2014 a basic description of the differences between convex and concave lenses. When you look through a magnifying glass, or take a picture with a camera, you are using a lens. Ppt convex lens powerpoint presentation free to view. First, i should point out that a typical microscope does not consist of two convex lenses. Microscope objectives and eyepieces themselves typically have anywhere from 310 lenses, including bi concave, bi convex, and meniscus lenses.
Describe how a prism forms a visible spectrum explain why different objects have different colors describe how mirrors reflect light example. A convex lens focuses light rays, whereas a concave lens causes the light rays to diverge. The word lens comes from lens, the latin name of the lentil, because a doubleconvex lens is lentilshaped. A convex lens is thicker at the centre than at the edges. Place the convex and concave lenses together in the path of the parallel rays. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Ppt on refraction and lenses by pg linkedin slideshare.
Each of a lens two faces is part of asphere and can be convex or concave if a lens is thicker at the center than theedges, it is a convex, or converging, lenssince parallel rays will be converged tomeet at the focus. This is effectively what you have in case of cameras, though they have somewhat more complicated optical system. A convex lenses refracts these parallel rays so that they are come together at a point called the principal. If the object is located outside the focal length of the lens, a real reversed image is formed on the viewer side. Whereas lenses used to correct myopia and hyperopia are spherical the power correction is the same throughout the lens astigmatism requires a special lens, called a toric lens. Slide the convex and concave lenses apart by few centimeter and observe the effect. Concave converging mirror it is a curved mirror in which the reflective surface bulges away from the light source. Oct 29, 2016 like many good questions, the answer is. Different types of lenses and their uses physics about. Sep 07, 2011 a guide to support non specialists with the lenses aspects of the new edexcel gcse. A concave lens will always produce diminished, upright and virtual image of the object in front of it.
Convex lenses are thicker in the middle than at the edges. Examples are the double concave lens both surfaces curved inward, the plano concave one surface flat, the other concave, and the convexo concave one surface convex, the other concave. We look at the image formation by these spherical lenses using ray diagrams. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Rays of light that pass through the lens are brought closer together they converge. A lens with one convex and one concave side is convex concave or meniscus. Concave or negative lenses will diverge spread out light rays. A lens which is thinner in the centerthan the edges is a concave, or diverging, lens since rays going through it will bespread out. If one of the surfaces is flat, the lens is plano convex or plano concave depending on the curvature of the other surface.
Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. What are some of the applications of convex lenses. Converging or convex lenses are those which thicker in. It can form both real and virtual images depending on where the light is coming from. Includes a lens activity teacher must provide a convex and concave lens directions for a lens foldable, and a quiz on the two types of lenses. And oftentimes, most lenses, the simpler lenses, are made this way. The socalled nimrud lens is a rock crystal artifact dated to the 7th century bc.
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