Convex and concave lenses purpose in this experiment, you will explore the difference between convex and concave lenses and determine their focal lengths. Concave converging mirror it is a curved mirror in which the reflective surface bulges away from the light source. A lens changes the direction of light waves by refraction. Convex lens uses, examples, definition, ray diagram, formula. Dec 18, 2010 a lens with one convex and one concave side is convex concave or meniscus. Demonstration of the optics of thin convex and concave. It will give a virtual upright image if the object is within the focal length. It includes notes, videos, questions, vocabulary and set homework.
Concave and convex lenses image formation curvature. Oct 29, 2016 like many good questions, the answer is. Find powerpoint presentations and slides using the power of, find free presentations research about concave and convex lens ppt. Winner of the standing ovation award for best powerpoint templates from presentations magazine. 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. 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. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. These lenses are used in the manufacture of corrective lenses.
Convex and concave lenses an image formed by a convex lens identify the known and unknown variables. A lens which is thinner in the centerthan the edges is a concave, or diverging, lens since rays going through it will bespread out. May 26, 2014 a basic description of the differences between convex and concave lenses. Convex lenses are therefore used in instruments like cameras, telescopes, etc. Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. But the nature of the image produced by a these lens depends upon the position of the object. Curved mirrors concave and convex linkedin slideshare. Convex lens and concave lens are two basic types of lenses. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Describe how a prism forms a visible spectrum explain why different objects have different colors describe how mirrors reflect light example. A convex lens is thicker at the centre than at the edges.
They also enable millions of people to see clearly and read comfortably. Light ray rules for convex lens and concave lens are discussed. A basic description of the differences between convex and concave lenses. Find powerpoint presentations and slides using the power of, find free presentations research about convex lens and concave lens ppt. 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. Difference between convex and concave lens convex vs. Slide the convex and concave lenses apart by few centimeter and observe the effect. 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. When you look through a magnifying glass, or take a picture with a camera, you are using a lens. Convex lens refers to the lens which merges the light rays at a particular point, that travels through it. 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. Rays of light that pass through the lens are brought closer together they converge.
It is important to follow these sign conventions for lenses. Nest the convex and concave lenses together and place them in the path of the parallel rays. It curves outward, and its middle is thicker than its edges. Continue in the same way with concave lens to get the final answer as 3. Microscope objectives and eyepieces themselves typically have anywhere from 310 lenses, including bi concave, bi convex, and meniscus lenses. Lenses lenses are made of transparentmaterials, like glass or plastic. Move the tip of the object arrow to move the object. For magnification, calculate the magnification of the first image. Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses.
Objects placed at distances beyond 2 f would form clear images on the screen inside the cameras. Difference between convex and concave lens with figure. Marys design proposal included a lot of convex lines. Move the point named focus to the right side of the lens to change to a concave lens. 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. Instead, a microscope consists of an objective and an eyepiece. 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. 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. Convex and concave lenses lenses and ray diagrams ocr. F optical axislight rays that come in parallel to the optical axis still diverge from the focal point.
Of the two types of lenses convex and concave, the concave lenses are used less frequently. Ppt convex and concave lenses powerpoint presentation. 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. Basic types of lenses convex lens concave lens type of image convex lens. For different positions of the object a convex lens forms images of varying sizes and nature at different locations. Concave lenses are thinner in the middle than at the edges. A concave lens will always produce diminished, upright and virtual image of the object in front of it.
Finding a mnemonic device for concave is easy enough. Converging or convex lenses are those which thicker in. Quiz if an object is 12 cm away from a convex lens of focal length 4 cm where will the image be. 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.
Convexoconcave lens article about convexoconcave lens by. Slide the convex and concave lenses apart to observe the effect of a combination of two lenses. Displaying powerpoint presentation on convex and concave lenses available to view or download. Apr 11, 2020 lenses of many different types are used in optical devices such as cameras, eyeglasses, microscopes, telescopes, and projectors. 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.
For an illustrated example of how images are formed with a. Difference between concave lens and convex lens science. Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer. Sep 07, 2011 a guide to support non specialists with the lenses aspects of the new edexcel gcse. Diverging lenses bend parallel rays away from one another.
A convex lens focuses light rays, whereas a concave lens causes the light rays to diverge. What does this tell you about the relationship between the focal lengths of these two lenses. 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. When light passes through concave lenses always bend away from each other toward the edges of the lens. A lens is a polished piece of glass or transparent plastic with curved surfaces. Shows definitions, light refracting, and objects that contain the lenses. The very simplest camera has no lens at all and uses a pinhole to focus the light. Microscope objectives and eyepieces themselves typically have anywhere from 310 lenses, including biconcave, biconvex, and meniscus lenses. View and download powerpoint presentations on concave and convex lens ppt. Geometric optics intuition with mirrors and lenses concave convex diverging converging doc physics. 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. A lens with one convex and one concave side is convex concave or meniscus. Optics became part of the bedrock of physics in 1611, kepler improved on galileos telescope by replacing its concave eyepiece with a convex one.
Two types of lens diverging lens or concave lens converging lens or convex lens. We look at the image formation by these spherical lenses using ray diagrams. Convex lenses are thicker in the middle than at the edges. Move the point named focus to change the focal length. 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. There are three types of convex lenses plano convex lens concavo convex lens doubleconvex lens. Moving up one step from there, a camera with a single element lens has a convex lens. Uses of the concave mirror and the convex mirror in our daily life. A spoon is a kind of a curved mirror with both concave and convex surfaces. A lens with two concave surfaces is biconcave or just concave. Microscopes have a convex lens and a concave mirror and a flat mirror to magnify small images on a slide.
This is effectively what you have in case of cameras, though they have somewhat more complicated optical system. Lets look at the four combinations of virtualreal convexconcave lenses for a single lens. Jet printing of convex and concave polymer microlenses osa. Powerpoint ppt presentation free to view light refraction and lenses concave lenses in this picture the concave lens forms an image that is smaller.
Experiments involve deciding what type od lenses pupils are given and calculating focal length. If one of the surfaces is flat, the lens is plano convex or plano concave depending on the curvature of the other surface. Place the convex and concave lenses together in the path of the parallel rays. Convex lenses cause light to come together converge to a focal point. Vision problems and contact solutions contact lenses. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect.
Oct 27, 2012 power point uses slides from resources on tes and the worksheets are from btec collins resources. A convex lenses refracts these parallel rays so that they are come together at a point called the principal. A lens with one convex and one concave side is convexconcave or meniscus. Convex concave convex lenses bending toward the normal on a convex surface brings light rays together concave lenses bending. This lens is thick at the center but thin at the edges. Ppt on refraction and lenses by pg linkedin slideshare. Simulation of image formation in concave and convex lenses. View and download powerpoint presentations on convex lens and concave lens ppt. 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. 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. The eye and sight contrast ways in which light rays are bend by concave and convex lenses. Ppt mirrors and lenses powerpoint presentation free to. 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.
And oftentimes, most lenses, the simpler lenses, are made this way. Theres a cave in concave, and caves are inward curvatures. 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. 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 this type of lens that is most commonly used in corrective lenses. Concave or negative lenses will diverge spread out light rays. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. What are some of the applications of convex lenses. So remember, concave means it opens inward, like a cave. A convex lens is a type of spherical lens that converges the ray of light coming from the object. Presentation powerpoint file 346 kb 10 pages product description. Object is past r between r and f on the other side inverted real object at r. 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.
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. Convexoconcave lens article about convexoconcave lens. Convex lenses are converging lenses, and concave lenses are diverging 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. 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.
There are two main shapes of lenses, convex and concave. The word lens comes from lens, the latin name of the lentil, because a doubleconvex lens is lentilshaped. Properties of the formed images by convex lens and concave. Concave lenses cause light rays to spread out diverge. If the object is located outside the focal length of the lens, a real reversed image is formed on the viewer side. The socalled nimrud lens is a rock crystal artifact dated to the 7th century bc. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. There are two kind of a curved mirror, the concave and the convex mirrors.