Each mirror has a radius of curvature r which is in. Convex lenses are converging lenses, and concave lenses are diverging lenses. The focal length of a convex lens is positive, while that of a concave lens is negative. Ill be the object in this video and you need to find my image. A lens with two concave surfaces is biconcave or just concave. Objects appear different when viewed through convex lenses depending on how you hold them. A lens with one convex and one concave side is convex concave or meniscus. Convex mirrors show things the right way up and usually smaller. 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. Images through lenses as real, virtual, erect or magnified definition. Image formed by concave and convex lens physics grade xi. Eight important differences between convex and concave lens are compiled in the article in tabular form. Curved mirrors concave and convex linkedin slideshare.
Demonstration of the optics of thin convex and concave lenses. 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 concave lens contains at least one inwardlycurved surface, and it is also referred to as a divergent lens. Thin lens formula with magnification for concave and convex lenses. A mirror that bulges inwards is called a concave mirror.
Parallel rays of light passing through a thin convex lens cross at the focal point of the lens. Convex converging and concave diverging lenses are drawn as. Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. Focal length f f is positive for converging and negative for diverging lenses. 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. It will give a virtual upright image if the object is within the focal length. Move the point named focus to change the focal length. There are two main shapes of lenses, convex and concave. We look at the image formation by these spherical lenses using ray diagrams. 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. There are two types of curved mirror convex and concave.
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. 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 mirror that bulges outwards is called a convex mirror. To investigate the image formed by a certain thin convex lens and to determine its focal length. Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. Combining convex lens and concave lenses eliminates both undesirable effects. Uses of the concave mirror and the convex mirror in our daily life. Demonstration of the optics of thin convex and concave. Concave mirrors and convex mirrors image formation, ray diagram.
Move the tip of the object arrow to move the object. Mar 03, 2019 convex and concave lenses are spherical lenses. Draw a ray diagram and use the information from the ray diagram to fill in the box. 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. What are the uses for concave lenses and convex lenses. The focal length is measured from the center of the lens to the focal point. Conversely, the concave lenses are thinner at the centre and thicker at its edges, in structure. Strain responsive concave and convex microlens arrays. To explore the difference between convex and concave lenses and to determine their focal lengths. Use this quiz and worksheet to gauge your comprehension of a concave lens. Jonny nelson introduces an animated explanation of lenses. 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. Convex and concave lensesconvex and concave lensesconvex and concave lenses are spherical lenses.
Concave and convex lenses image formation curvature. For aconcave lens, the lens equation is the same but the value of fis nownegative. The following typical equation is used to determine a relation between the focal length of the lens, the distance of object and distance of. Displaying top 8 worksheets found for concave and convex lenses. Of the two types of lenses convex and concave, the concave lenses are used less frequently. Light ray rules for convex lens and concave lens are discussed. Convex or converging lenses act like concave or converging mirrors.
Convex lenses are used for focusing light rays to make items appear larger and clearer, such as with magnifying glasses. If one of the surfaces is flat, the lens is plano convex or plano concave depending on the curvature of the other surface. Focal length f is positive for converging and negative for diverging lenses. Surface topography and refractive index profile dictate the deterministic functionality of a lens. Convex lens converging lens concave lens diverging lens convex lens a convex lens is shaped like two half circles, thin at the edge and thick at the middle. One such difference is the structure of convex lens is like, thicker at the centre and thinner at the edges. On the contrary, the image formed by the concave lens is erect, virtual and smaller, than the object. The convex microlens array is replica molded from the concave lenses in pdms. Topics youll need to understand include uses for lenses and types of lenses. 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. Diverging lenses bend parallel rays away from one another. Lenses are used in all optical instruments, like microscopes, telescopes, cameras, projectors etc. Module 4, lesson 4 grade 8 science learning activity.
The image might be smaller as in a camera, or larger as in a microscope. 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. If the thickness of a lens is negligible in comparison to the radius of curvature, it is a thin lens. To find the focal point and focal length of convex and concave lens.
A convex lens is thicker at the centre than at the edges. Apparatus selection of lenses, collimated light source, e. 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. Due to difference in lens formation mechanisms, the two types. Geometric optics intuition with mirrors and lenses concave convex diverging converging doc physics duration. 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.
Ray diagram for image formation by lenses is shown in the attached figure. A lens is a shaped piece of transparent glass or plastic that refracts. In this article, we will learn about image formation by concave and convex lenses. Using these rules we can find the position and properties of the image. 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.
Oct 23, 2019 lenses are used in all optical instruments, like microscopes, telescopes, cameras, projectors etc. Nature of images by a convex and concave lenses with ray diagrams. Concave lenses video geometric optics khan academy. A convex lens is converging and can produce virtual and real images. 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. Convex and concave lenses purpose in this experiment, you will explore the difference between convex and concave lenses and determine their focal lengths. 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. Thin lens formula for concave and convex lenses byjus.
To understand ray diagrams it is important to know something about images. Students will read a sentence and decide if it is describing a concave or convex lense, then glue the box in the correct column. 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 polarity of most lenses reported so far, that is, either positive convex or negative. Concave and convex lens 4th grade activity free pdf file. Concave lenses are used for correcting myopia or shortsightedness. Properties of the formed images by convex lens and concave. Move the point named focus to the right side of the lens to change to a concave lens. 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. 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. A convex lens, on the other hand, refracts light of different colors at different angles, creating a fringe effect around bright objects in the picture. A thin convex lens can be characterized by its focal length f, the object distance, d o.
Concave or diverging lenses act like convex or diverging mirrors. Concave lenses concave lenses always produce upright, virtual images. Oct 24, 20 geometric optics intuition with mirrors and lenses concave convex diverging converging doc physics duration. What are the uses of concave and convex lenses in daily. Simulation of image formation in concave and convex lenses. Use the thin lens equation to find the distance of the image. Difference between convex and concave lens with figure. Concave and convex lens uses difference between concave. How you appear in a concave mirror depends on how close you are to it. Curving inward, concave lenses cause light to spread out, resulting in a smaller image for the viewer. Rays of light that pass through the lens are brought closer together they converge. Nature of images by a convex and concave lenses with ray.
A lens changes the direction of light waves by refraction. Typically the lens axis passes through the physical. This is a fun and engaging way to practice determining the differences between concave and convex lenses. Each surface can be convex bulging outwards from the lens, concave depressed into the lens, or planar flat. 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. A convex lens gives a real, inverted image if the object is outside the focal length of the lens.
Dec 08, 2018 eight important differences between convex and concave lens are compiled in the article in tabular form. Because a lens is curved, light rays strike different parts of its surface and are. Convex lens, optical bench, light source, target image slide, lens mounts, and screen. This report presents a lab experiment that hopes to introduce and familiarise. R 11 and r 2 2 are positive for convex outward surface and negative for concave surface. The line joining the centres of the spheres making up the lens surfaces is called the axis of the lens.
Ray diagrams for image formation by lenses diagram. Convex lenses, geometrical optics from alevel physics tutor. 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. Lenses lenses are made of transparentmaterials, like glass or plastic. Nature of image formed by convex lens and concave lens. Oct 10, 2018 it is best in our daily life to know that camera make image small how,projector make image larger than object,how we can we see distamt objects like moon,stars in our dialy life many of the girls and man wearing lenses,copier projector for this k. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.