Simulation of image formation in concave and convex lenses. The main difference between concave and convex lens is that a concave lens is thinner at the centre than it is at the edges, whereas a convex lens is thicker at the centre than it is at the edges. In ordinary usage, concave and convex are typically used when referring to glass surfaces, like the lenses of optical viewing equipment. Physics mcqs for class 12 with answers chapter 9 ray.
A convex lens is thicker in the middle than it is at the edges. A lens with one convex and one concave side is convex concave or meniscus. Jun 05, 20 lenses lenses are made of transparentmaterials, like glass or plastic. Displaying top 8 worksheets found for concave and convex lenses. Concave and convex lenses image formation curvature. A ray passing through the center of any lens continues in a straight line. A lens which is thinner in the centerthan the edges is. Let us find out what are mirror and lenses, phenomenas associated with them, applications, convex lens, concave lens, convex mirror, concave mirror in the form of mcqs. One mark questions convex mirror for seeing traffic at the. Some of the worksheets for this concept are diverging converging lens work, concaveconvex s1 identifying shapes, converging diverging lenses ray diagrams, name box score date ap physics work 14 chapter 24, refraction convex and concave lenses, exploration of optics converging and diverging.
Compare a study of convex and concave lenses seeing how theyre alike and different. Light ray rules for convex lens and concave lens are discussed. If the image formed by a convex lens is of the same. A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of 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. Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. Browse concave and convex resources on teachers pay teachers, a marketplace trusted by millions of teachers for original educational resources. Parallel rays of light passing through a thin convex lens cross at the focal point of the lens. Eight important differences between convex and concave lens are compiled in the article in tabular form. Uses of the concave mirror and the convex mirror in our daily life. So just remember, concave has the word cave in it so i always imagine that its kind of caving inwards caving inwards its a little bit of an exaggerated drawing but you get. We look at the image formation by these spherical lenses using ray diagrams. The size of the image is much smaller as compared to that of the object. Oct 23, 2019 let us find out what are mirror and lenses, phenomenas associated with them, applications, convex lens, concave lens, convex mirror, concave mirror in the form of mcqs.
Image formation by convex and concave lens ray diagrams. 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. Weve talked a lot about convex lenses, so i thought i would do a quick video on concave lenses, although there arent as many combinations of what a concave lens can do. This is explained with the help of ray diagrams as follows. Investigating convex lenses is a great place to begin or continue your study of optics. Jan 22, 2020 ray optics class 12 questions and answers pdf 11. Convex lens, optical bench, light source, target image slide, lens mounts, and screen. If the lens is biconvex or plano convex, a collimated beam of light passing through the lens converges to a spot a focus behind the lens. Convex lens screen purpose to determine the focal length of a thin lens and to explore the difference between convex and concave lenses and to determine their focal lengths. Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. The focal length is measured from the center of the lens to the focal point. Move the point named focus to the right side of the lens to change to a concave lens. Physics mcqs for class 12 with answers chapter 9 ray optics.
A concave lens is a lens that is thinner at the centre than it is at the edges, i. Showing top 8 worksheets in the category concave and convex. A lens with one convex and one concave side is convexconcave or 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. This is shown in slide 25 user can change the position of the object along the principal axis. Measure the approximate focal length of the lens by focusing a distant object onto a screen and measuring the distance. Difference between convex and concave lens convex vs. 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. 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. The power of the combination in dioptres is a zero b 25 c 50 d infinity. Students will read a sentence and decide if it is describing a concave or convex lense, then glue the box in the correct column. Snc 2d light and geometric optics convex mirrors extra practice worksheet a draw a ray diagram for each to locate the image.
Mar 04, 2015 is an educational software that helps students develop flexible knowledge, effective problem solving skills, selfdirected learning, intrinsic motivation. Determination of focal length of a converging lens and mirror. If one of the surfaces is flat, the lens is planoconvex or planoconcave depending on the curvature of the other surface. In mirrors, images are formed through reflection but lenses form images through refraction.
Properties of the formed images by convex lens and concave. In general, the image formed by a convex mirror is upright. Image formation in a convex lens can be explained with the help of three principal rays shown in the figure. Dec 08, 2018 eight important differences between convex and concave lens are compiled in the article in tabular form. To investigate the image formed by a certain thin convex lens and to determine its focal length. Some of the worksheets displayed are concaveconvex s1 identifying shapes, physical science 2014 2015 concave and convex mirrors, 6 introduction to polygons, diverging converging lens work, convex concave polygons 1, 04, polygons quadrilaterals and special parallelograms, 1 1 1 h d i i in every problem draw. Record p, q, and hi for four different relative positions of the object, lens and image screen. Concave lenses video geometric optics khan academy. When an object is placed behind the center of curvature, the real image is formed between the center of curvature and focus. Whenever a light ray hits the interface between two tr ansparent materials, generally some of the.
If the lens is biconvex or planoconvex, a collimated beam of light passing through the lens converges to a spot a focus behind the lens. A concave spherical mirror has the silvered surface of the mirror. Topics youll need to understand include uses for lenses and types of lenses. Image formation lenses convex converging lens laws of refraction and reflection can be used to explain how lenses and mirrors operate parallel rays e. Lets practice problems involving both the lens and magnification formulas in convex and concave lenses. Tippens, professor of physics southern polytechnic state university.
Determine the combined strength of a thin convex lens and a thin concave lens placed close together if their respective focal lengths are 10cm and 20cm. Describe the shapes of three typical converging positive thin lenses and three typical diverging. If youre seeing this message, it means were having trouble loading external resources on our website. In this article, we will learn about image formation by concave and convex lenses. Nov 15, 2017 on the contrary, in a concave mirror, the reflecting surface bulges inwards the main difference between a convex and concave mirror lies in the image formed by the two mirrors, i. Some of the worksheets for this concept are diverging converging lens work, concaveconvex s1 identifying shapes, converging diverging lenses ray diagrams, name box score date ap physics work 14 chapter 24, refraction convex and concave lenses, exploration of optics converging and diverging lenses, ray. A lens with two concave surfaces is biconcave or just concave. This is a fun and engaging way to practice determining the differences between concave and convex lenses. The refraction at the first surface is balanced by the refraction at the second surface.
The assignments are adobe pdf forms with fillable fields. One mark questions convex mirror for seeing traffic at. Causes light rays to bend toward each other converge 2. A thin convex lens can be characterized by its focal length f, the object distance, d o. This report presents a lab experiment that hopes to introduce and familiarise. Conversely, the concave lenses are thinner at the centre and thicker at its edges, in structure. 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. Each mirror has a radius of curvature r which is in. Observe how the different lenses change the direction of the light rays. Mar 03, 2019 convex and concave lenses are spherical lenses.
If the image formed by a convex lens is of the same size as that of the object. The focal length of a convex lens is positive, while that of a concave lens is negative. View and download powerpoint presentations on concave and convex lens ppt. Move the point named focus to change the focal length. Whenever a light ray hits the interface between two. The lateral magnification of the mirror or lens is the ratio.
Nature of image formed by convex lens and concave lens. They come together at a point called the principal focus. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. The surface may be either convex bulging outward or concave bulging inward. Compare convex lenses to pinholes and see how they are similar and differ.
Figure 315 defining points for concave and convex mirrors. To explore the difference between convex and concave lenses and to determine their focal lengths. Convex converging and concave diverging lenses are drawn as. This is a simple lab that you can do with just 1 easy supply. Concave is an adjective that describes a surface that curves inward, or is thinner in the middle than on the edges. A convex mirror can only produce a virtual image since all reflected rays will diverge. For session 20192020 free pdf will be available at. 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. Chapter 34a reflection and mirrors geometrical a powerpoint presentation by paul e. While clicking on the concave lens button, a concave lens, object and its image will be displayed in the window. A convex lens focuses light rays, whereas a concave lens causes the light rays to diverge. To create a real image with a concave mirror, the object must be outside the focal point.
Geometrical optics in the study of how light behaves, it is. The power of the combination in dioptres is a zero b 25 c. It will give a virtual upright image if the object is within the focal length. One such difference is the structure of convex lens is like, thicker at the centre and thinner at the edges. On the contrary, in a concave mirror, the reflecting surface bulges inwards the main difference between a convex and concave mirror lies in the image formed by the two mirrors, i. Difference between convex and concave mirror with comparison. Lenses convex concave optical instruments mirrors convex concave. When an object is placed at infinity, the real image is formed at the focus. Lenses lenses are made of transparentmaterials, like glass or plastic.
The converging lens is thicker at its center than at its edge. Which can make real images, which can cast a shadow. Generally, a convex lens forms a real image, but it can also create a virtual image when the object is in the middle of the focus and optical centre. They are the type of lens responsible for magnification and are the most common lens used in. Find powerpoint presentations and slides using the power of, find free presentations research about concave and convex lens ppt. Oct 12, 2015 the main difference between concave and convex lens is that a concave lens is thinner at the centre than it is at the edges, whereas a convex lens is thicker at the centre than it is at the edges. Difference between convex and concave lens with figure. It is this type of lens that is most commonly used in corrective lenses.
Move the tip of the object arrow to move the object. Use this quiz and worksheet to gauge your comprehension of a concave lens. Apparatus selection of lenses, collimated light source, e. Concave and convex lens uses difference between concave.
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