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