Rays from a single point on a distant object arrive at the lens apart centre concave converging eye focal focus inwards parallel real transparent virtual to one. Displaying top 8 worksheets found for concave and convex lenses. In this article, we will learn about image formation by concave and convex lenses. Use the lensmakers equation to determine the focal length of a thin lens. Convex lens, optical bench, light source, target image slide, lens mounts, and screen.
Curved mirrors concave and convex linkedin slideshare. Concaveconvex mirror and lenses for ssc cgl, chsl, mts. Measure the approximate focal length of the lens by focusing a distant object onto a screen and measuring the distance. Convex lenses, geometrical optics alevel physics tutor. A lens with one convex and one concave side is convex concave or meniscus. Trial lens set luxvision us ophthalmic pdf catalogs. This report presents a lab experiment that hopes to introduce and familiarise. Snc 2d light and geometric optics convex mirrors extra practice worksheet a draw a ray diagram for each to locate the image. Repeat the measurement by adjusting the distance between lamphousing and the screen s to roughly about 5. Because the concavity of a concave lens creates something called a focal point convex lenses have it as well, its just placed a bit more differently, and this allows light waves to focus at the focal point. Cbse 2011 a convex lens of smaller focal length can be used as magnifying glass. Ray diagrams for image formation by lenses diagram. Give reasons and draw a ray diagram to support your answer.
Light that passes through a convex lens can be focused on a surface like a 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. It is this type of lens that is most commonly used in corrective lenses. Concave lenses video geometric optics khan academy.
Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer. Free pdf download of cbse physics multiple choice questions for class 12 with answers chapter 9 ray optics and optical instruments. 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. 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. Ncert cbse solutions for class 10 science chapter 10. Ray 1 is parallel to the axis and reflects through f. Rays of light that pass through the lens are brought closer together they converge. Convex lenses are converging lenses, and concave lenses are diverging lenses. We look at the image formation by these spherical lenses using ray diagrams. When the upper half of the lens is covered by an opaque.
A convex lens gives a real, inverted image if the object is outside the focal length of the lens. 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. 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. What focal length concave lens is needed to form a virtual image 10 cm from the lens when the object is 35 cm from the lens. 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. Apparatus selection of lenses, collimated light source, e. Of the two types of lenses convex and concave, the concave lenses are used less frequently. Each mirror has a radius of curvature r which is in.
It will give a virtual upright image if the object is within the focal length. Draw a ray diagram and use the information from the ray diagram to fill in the box. On the contrary, the image formed by the concave lens is erect, virtual and smaller, than the object. One mark questions convex mirror for seeing traffic 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. To explore the difference between convex and concave lenses and to determine their focal lengths. Ray box multiple white rays convex lens concave lens metric rule second convex lens optional procedure.
Light ray rules for convex lens and concave lens are discussed. 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. To create a real image with a concave mirror, the object must be outside the focal point. Simulation of image formation in concave and convex lenses. Uses of convex lens, concave lens, convex mirrors, concave mirrors lenses and mirrors applications study for exams optics,physics s. Determination of the focal length of thin converging and diverging lenses using. Fun interactive lab for california life science standard 7. After passing the lens, the light beam focuses in one point or a virtual focus. The focal length is measured from the center of the lens to the focal point.
Convex and concave lenses jonny nelson introduces an animated explanation of lenses a lens is a shaped piece of transparent glass or plastic that refracts light. A for concave lens and mirror focal length is negative. Conversely, the concave lenses are thinner at the centre and thicker at its edges, in structure. The curved surface forms a part of the spherical lens and the dioptric power on all axis positions is the same. Uses of convex lens,concave lens,convex mirrors,concave. Report these and other data in a nicely crafted table. 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. 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.
Physics mcqs for class 12 with answers chapter 9 ray optics. A lens with one convex and one concave side is convexconcave or meniscus. The surface may be either convex bulging outward or concave bulging inward. Convex converging and concave diverging lenses are drawn as. Focal length of convex lens b11 lam ka yue kenneth 6s 20 date of experiment. The lateral magnification of the mirror or lens is the ratio of the image. 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. Move the point named focus to change the focal length.
Lets explore the ray tracing technique to figure out the properties of images when things are kept in front of a concave or a convex mirror. Since f is measured in metres m the units of lens power are m1. This is a fun and engaging way to practice determining the differences between concave and convex lenses. Figure shows the virtual image formed by convex lens and real image formed by concave lens.
The focal length of a convex lens is positive, while that of a concave lens is negative. Concave and convex lenses image formation curvature. Concave mirrors and convex mirrors image formation, ray diagram. One mark questions convex mirror for seeing traffic at the. Whenever a light ray hits the interface between two. Image formed by convex lens placed at different distances is shown in the figure. Cylindrical lens consists of concave cylindrical lensand convex cylindrical lens that are used to examine astigmatism. Setup the lens apparatus as shown in figure 3, using the convex lens. 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. 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 chapter wise with answers pdf download was prepared based on latest exam pattern. Lens in a washer lab using convex and concave lens. Parallel rays of light passing through a thin convex lens cross at the focal point of the lens. Difference between convex and concave mirror with comparison.
It happens due the fact that rays focus on the object and the object looks bigger than its actual size. Nature of images by a convex and concave lenses with ray. To investigate the image formed by a certain thin convex lens and to determine its focal length. Difference between convex and concave lens with figure. Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. Measure the approximate focal length of the lens by focusing a distant object onto a screen and measuring the distance from the lens to the screen using the metre stick. Use the thin lens equation to find the distance of the image. When an object is placed in between the pole and focus of the convex lens then enlarged, erected and same side of object image is formed. Move the tip of the object arrow to move the object.
Uses of convex lens,concave lens,convex mirrors,concave mirrors lenses and mirrors applications study for exams optics,physics s. A convex apart centre concave converging eye focal focus inwards parallel real transparent virtual lens is curved outwards on both sides. Physics mcqs for class 12 with answers chapter 9 ray. 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.
Students will read a sentence and decide if it is describing a concave or convex lense, then glue the box in the correct column. 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. Mar 03, 2019 convex and concave lenses are spherical lenses. Lenses lenses are made of transparentmaterials, like glass or plastic. Concave and convex lens uses difference between concave. Demonstration of the optics of thin convex and concave. What are the uses of concave and convex lenses in daily life. Jan 22, 2020 students can solve ncert class 12 physics ray optics and optical instruments mcqs pdf with answers to know their preparation level. No matter how far you stand from a mirror, your image appears erect and smaller than you.
Dec 08, 2018 the focal length of a convex lens is positive, while that of a concave lens is negative. This video contains the properties of concave mirror, concave lens, convex mirror and convex lens and also the types of questions, which could be asked fro. Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. A thin convex lens can be characterized by its focal length f, the object distance, d o. Students can solve ncert class 12 physics ray optics and optical instruments mcqs pdf with answers to know their preparation level. A convex mirror can only produce a virtual image since all reflected rays will diverge. Figure 315 defining points for concave and convex mirrors. A concave lens is just the opposite of a convex lens. Record p, q, and hi for four different relative positions of the object, lens and image screen. Using these rules we can find the position and properties of the image. Convex and concave lensesconvex and concave lensesconvex and concave lenses are spherical lenses. Ray optics and optical instruments class 12 physics mcqs pdf.
Rays parallel to the axis get reflected through a common point the focal point or focus f. Difference between convex and concave lens convex vs. Ray 2 passes through f before reflecting parallel to the axis. 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. Using the five white rays from the ray box, shine the rays straight into the convex. 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. What are the uses of concave and convex lenses in daily. Ill be the object in this video and you need to find my image. Whenever a light ray hits the interface between two tr ansparent materials, generally some of the. A lens with two concave surfaces is biconcave or just concave. When you finish the lesson, you should know how to. Students will have fun learning about how convex and concave lens work.
A convex lens enables a thing to look bigger than its actual size. Convex and concave lenses purpose in this experiment, you will explore the difference between convex and concave lenses and determine their focal lengths. Properties of the formed images by convex lens and concave. 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. The mirror and the lens are likely to be a both concave. Uses of the concave mirror and the convex mirror in our daily life.
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