Uses of the concave mirror and the convex mirror in our daily life. Convex mirrors have reflective surfaces that curve outward. Draw a ray diagram to show the formation of a virtual image by a concave mirror. In order to make a magnifying glass, two convex mirrors are placed back to back. There are many differences between concave and convex mirrors and some of them are as follows. Use a light source, concave mirror, and half screen accessory on an optics bench to measure the focal length of the concave mirror. Know about concave and convex mirror for class 7 aiye. Pdf optical images due to lenses and mirrors researchgate. Uses of convex mirrors mirror at concealed entrances, mirror to deter shoplifters, and car door mirrors. A mirror is curved outward, like the bottom of a spoon. The center of curvature of the mirror, c, is twice the focal length. What links here related changes upload file special pages permanent link. Objects reflected in concave mirrors often appear bigger than they really are, although the specifics of how the image appears depends upon the objects distance from the mirror. A convex mirror can only produce a virtual image since all reflected rays will diverge.
Ifthe outside, or convex surface, is silvered, we have a convex mirror. Spherical mirrors in which inward surfaces are painted are known as convex mirrors while the spherical mirrors in which outward surfaces are painted are known as concave mirrors. Concave mirrors are widely used in headlights of automobiles and motor vehicles, torch lights, railway engines, etc. A spherical mirror is a mirror that has the shape of a piece cut out of a spherical surface. Concave mirrors are most commonly used in shaving because of its reflective and curved surface. On another sheet draw curved mirror line of the concave cylindrical mirror not the convex side near the top of the paper. A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a concave mirror.
The reflective surface of the convex mirror bulges towards the light source. A for concave lens and mirror focal length is negative. Aug 24, 2017 convex mirrors are also called as divergent mirrors, because convex mirrors cause the rays of light parallel to its axis to diverge. Uses of convex mirror image formation on a convex mirror. Concave mirrors are also known as a converging mirror since the rays converge after falling on the concave mirror while the convex mirrors are known as diverging mirrors as the rays diverge after falling on the convex mirror. The laboratory room must be darkened so that images are easily observed. Large concave mirrors are used to concentrate sunlight to produce maximum heat in the solar furnaces. A mirror that bulges inwards is called a concave mirror. The image formed by the convex mirror is virtual, erect, diminished and is formed closer to the mirror than the actual object. Hold a concave mirror in your hand and direct its reflecting surface towards the. Convex mirrors are widely used as rear view mirrors in automobiles and vehicles because it can diverge light beams and make virtual images. Figure 33b shows the reflection of several light rays at a curved mirror surface, and.
A concave surface curves inward, like the mouth of a cave. They should try to describe any images they form in terms of magnification, upright or inverted, real or virtual. Convex mirrors focus light rays behind the surface of the mirror, or inside of it. On the contrary, concave mirrors are used in torches and vehicle headlights. Nov 08, 20 concave mirror real image demonstration homemade science with bruce yeany. Define the following terms in relation to concave spherical mirror. The cartesian sign convention is used here using a ray parallel to the principal axis and one incident upon the center of the mirror, the position of the image can be constructed by backprojecting the rays which reflect from the mirror. The point of intersection between the mirror and the principal axis is called the pole. In addition, you need to have a small object penny, pair of dice, etc and a large object cabinet, door, tv, etc for students to examine. With mirrors, the curved surface is referred to as either concave or convex depending upon whether the center of curvature occurs on the side of the reflecting surface or the opposite side. The expanded field of view results in the smallerthanreallife image you see hence the typical warning objects in mirror are. Apr 06, 2012 this video demonstrates and discusses ray diagrams for concave and convex mirrors.
The most common nonspherical type are parabolic reflectors, found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror. Convex mirrors are widely used for making magnifying glasses. Concave mirrors are used in car headlights, in dentists offices and in makeup mirrors. Convex mirrors show things the right way up and usually smaller. Ray tracing activity curved mirrors extension worksheet pdf this file relates to bonus feature 2. The following table illustrates the image formed by a concave mirror for different positions of the given object. If the outside surface is polished, is it a convex mirror. Gk questions and answers on lenses and mirrors mirrors are polished metal that forms images and lenses are transparent glass having curved sides which are used in optical instruments. The concave mirrors, curved as the inside of a bowl, are used for focusing light, and the images often appear larger and.
Concave mirrors and convex mirrors image formation, ray diagram. Difference between concave and convex mirrors duration. Concave mirror is also used by dentists, to see the large images of the teeth of patients. Focal length of a concave mirror experiment class 12 cbse c. Applications and uses of concave mirror in daily life byjus. Apart from other applications, the convex mirror is mostly used as a rearview mirror in vehicles. The concave mirrors, curved as the inside of a bowl, are used for focusing light, and the images often appear larger and upside down to the original object. Large convex optics can be measured using custombuilt fizeau interferometers that use concave test plates slightly larger than the convex surface. But virtual image formed in concave mirror has magnification always greater than 1 means larger than size of object. Uses of convex mirrorswe saw that, image formed by convex mirrors isposition of the objectposition of the imagesize of the imagenature of the imageat infinityat the focus f,behind the mirrorhighly diminished,pointsizedvirtual and erectbetween infinityand. Images formed by convex mirror using ray diagram class. The convex mirror is used as sideview mirror on the passengers side of a car because it forms an erect and smaller image for the way behind the car. All additional elements and decoration on the left are consistent with a viewpoint from above, while those on the right with a viewpoint from below.
The lab activity requires the use of concave and convex lenses. All of them are segments of spheres centered on a horizontal axis. One such difference is the structure of convex lens is like, thicker at the centre and thinner at the edges. Convex mirrors are commonly used in retail stores and hospitals so people can see around corners. The convex mirror has a reflective surface that curves outward. Applications and uses of concave and convex mirrors teachoo. A concave mirror is a mirror that is curved inward in the middle. Shedding light on curved mirrors programsupport notes. Comparing concave and convex mirrors we compare concave mirrors with convex mirrors pointwise. There are two types of curved mirror convex and concave. Uses of convex lens, concave lens, convex mirrors, concave. Where will the image form if the same object is placed 15 cm in front of a convex mirror with a focal length.
A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Curved mirrors are roughly divided into two categories, concave and convex, terms that are also used to describe the geometry of simple thin lenses. A convex lens is known as a converging lens, whereas a concave lens is also known as a diverging lens. Difference between concave and convex concave vs convex. One mark questions convex mirror for seeing traffic at. 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 mirror that bulges outwards is called a convex mirror. The terms concave and convex are from the perspective of the object. Apr 26, 2009 concave mirrors have a arched surface of reflection that is bulged in caved. They should try to describe any images they form in terms of magnification, upright or inverted, real or. Uses of convex mirrorswe saw that, image formed by convex mirrors isposition of the objectposition of the imagesize of the imagenature of the imageat infinityat the focus f,behind the mirrorhighly diminished,pointsizedvirtual and erectbetween infinityand the pole p ofthe mirrorbetween p and f,behin. The principal focus of a convex mirror is a point on its principal axis from which a beam of light rays, initially parallel to the axis, appears to diverge after being reflected from the convex mirror. Spherical mirrors are the mirrors having curved surfaces which are painted on one of the sides.
The image formed by a plane mirror is always a virtual image as it cannot be obtained. In this article, we will learn about image formation by concave and convex mirrors. Uses of the concave mirror and the convex mirror in our. Jul 28, 2006 concave is bulging inward, convex outward. The introduction to mirrors and lenses discusses the law of reflection, angle of incidence, the difference between concave and convex mirrors, and converging and diverging lenses. Each mirror has a radius of curvature r which is in. A convex mirror is also known as diverging mirror or the fish eye mirror. The surface may be either convex bulging outward or concave recessed inward. If a curved mirror is a part of a sphere then it is known as a spherical mirror. Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. Uses of convex mirrorswe saw that, image formed by convex mirrors isposition of the objectposition of the imagesize of the imagenature of.
The convex mirror is suitable for convenient shop and big supermarket and any other corner where need antithief, it is used in the turning off the road and parking. No matter how far you stand from a mirror, your image appears erect and smaller than you. If you continue browsing the site, you agree to the use of cookies on this website. Light, color, and their uses introduction 181kb pdf file. A spherical mirror is a part of a spherical reflecting surface. If the inside surface of the spherical mirror is polished, it is a concave mirror. Concave and convex maintain their status as adjectives when used in this context. Convex mirror holders clay for mirror, metric ruler 2 meter sticks screen and light source light source procedure.
Shedding light on curved mirrors liacos educational media. Geometrical optics in the study of how light behaves, it is. You must understand the differences between these two kinds of mirrors, be able to draw ray diagrams for both kinds of mirrors, and be able to solve the lens equation for both kinds of mirrors. A concave mirror is a spherical mirror in which the reflecting surface and the center of curvature fall on the same side of the mirror. Ncert cbse solutions for class 10 science chapter 10. In a convex mirror, parallel light rays move away from each other, as you can see in the diagram below on the left. The purpose of this activity is to measure the focal length of a concave mirror. Uses of concave mirrors uses of convex mirrors an image that is formed by the apparent intersection of light rays. Use a piece of masking tape to hold the meter sticks in place. For plane mirrors, the object distance equals the image distance and all images are erect and virtual. Some of the most important and common application of concave mirror are described below. To create a real image with a concave mirror, the object must be outside the focal point.
Eight important differences between convex and concave lens are compiled in the article in tabular form. Convex mirrors are used as rearview mirrors in cars, to enable the driver to see the traffic behind him. A spherical mirror whose reflecting surface is curved outwards, is called a convex. They also have different properties of reflection and production of image. The inner side of the hollow sphere is called the concave side and the outer side is called the convex mirror. Quiz on mirrors ian upright object is located in front of a convex mirror a distance greater than the focal length. Uses of concave mirror the concave mirror is a converging mirror, so that it is used for many purposes, it is used as a torch to reflect the light, it is. All images formed from convex mirrors are erect, virtual, and diminished in size. The surface may be either convex bulging outward or concave bulging inward. Conversely, the concave lenses are thinner at the centre and thicker at its edges, in.
The electric light sources are sufficient to illuminate laboratory work areas while students set up equipment. In this lesson, learn about the types of images that can be formed by a convex mirror and some of the uses of convex mirrors. Compare plane mirrors, concave mirrors, and convex mirrors. The light source is placed at the focus of the mirror, so after reflecting the light rays travel over a huge distance as parallel light beams of high intensity. One can view these features as concave by viewing the image upsidedown. I will tell only 10 common uses of convex mirror because there are many of them concept. A ray passing through the focus of a concave mirror or proceeding toward the. Convex mirrors are useful because by demagnifying they squeeze a lot of the world into a small image, so they allow us to look in lots of directions at once. Convex mirrors are often used in convenience stores for security purposes, or on the passenger side of automobiles to provide a wider view. Use the mirror formula to show that aan object placed between f and 2f of a concave mirror produces a real image beyond 2f ba convex mirror always produces a virtual image independent of the location of the object can object placed between the pole and focus of a concave mirror. Both sideview and rearview mirrors are convex, which means that the image focal point is actually behind the mirrors and the reflected rays spread outward. Image formation by curved mirrors a concave cylindrical mirror 1.
Question 1 mention few applications of convex mirror. The law of reflection applies, just as it does for a plane mirror, i. Question 2 the image formed by a convex mirror is seen to be erect,virtual and diminished. Shedding light on curved mirrors liacos educational media page 1 of 9 shedding light on curved mirrors programsupport notes in this outstanding program, presenter spiro liacos uses clear, reallife examples and superb animations to explain how and why convex and concave mirrors are so useful. A ray parallel to mirror axis passes through the focal point of a concave mirror or appears to come from the focal point of a convex mirror. Concave and convex are also two types of spherical mirrors. A spherical mirror consists of a small section of the surface of a sphere with one side of the surface covered with a polished reflecting material, usually silver or aluminum. Chapter 34a reflection and mirrors geometrical a powerpoint presentation by paul e. Concave mirrors are called converging mirrors because as light falls on the mirror, it collects the light and refocuses the parallel incoming rays. Concave and convex mirrors unlike light rays hitting a flat mirror, parallel light rays reflecting off a curved mirror do not move in the same direction.
Lenses concave and convex apparatus selection of lenses, collimated light source, e. Dentists also use a concave mirror to get the bigger image of the teeth. But, when they are curved, they produce images that are different from those formed by plane mirrors. The concave mirror is a converging mirror, so that it is used for many purposes, it is used as a torch to reflect the light, it is used in the aircraft landing at the airports to guide the aeroplanes, it is used in shaving to get an enlarged and erect image of the face. The image formed by a convex mirror is a virtual image, while concave mirror forms a real or virtual image, depending on the position of the object. Difference between convex and concave lens with figure. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
Common examples of curved mirrors stainless steel spoons, ladles, vessels with round bases, car mirrors, shaving and hub caps of car wheels. Mar 07, 2018 both concave and convex mirror can produce an image of positive magnification which means images are erect and virtual. All the rays parallel to the principal axis falling on the surface of the convex mirror seem to meet at a point on the other side of the mirror. Such an image can be located on a screen or by the method of no parallax. The plane mirror is a flat surface, where the object reflected has an image the same size. Snc 2d light and geometric optics convex mirrors extra practice worksheet a draw a ray diagram for each to locate the image. A concave mirror is a curved mirror that bulges inward.
Grade 8 science ray diagrams for convex mirrors convex mirrors stick out they have a curved shape that curves towards the object in front of the mirror. Cbse 2011 we require minimum two rays for locating the image formed by a concave 27. Images formed by convex mirror using ray diagram 1 object is between infinity and pole a image is formed between pole and focus. Focal length of a concave mirror experiment class 12 cbse. It is also useful in vehicle headlights and torches. Concave and convex mirrors ray diagram for convex and concave mirror a mirror is a part of a smooth and highly polished reflecting surface. In this article, we will be studying the spherical mirrors structure and its different types in detail. We deliver all major cities in australia melbourne, sydney, brisbane, adelaide, gold coast qld.
Read about properties of convex mirror and concave mirror at. I use simple small ones that are cheap and easy to buy. A light bulb is 60 cm from a concave mirror with a focal length of 40 cm. The different shapes of plane, concave, and convex mirrors cause them to reflect light in distinct ways. In a reflector telescope, light from the object of interest enters the far end of the telescope and strikes a concave mirror at the end closest to the viewer. Concave and convex are two classes of spherical mirrors. The mirror landing aid system of modern aircraft carriers also uses a concave mirror. Figure 1 shows the three types of mirrors we will consider. Since a concave mirror converges a parallel beams of light rays, it is also called converging mirror.
A powerpoint presentation about curved mirrors concave and convex in science 10 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Three types of mirrors are plane mirrors, concave mirrors and convex mirrors. Mirror used in supermarkets convex mirrors lens used as rear view mirrors convex mirror mirror used as streetlight reflectors convex mirrors mirror used in making lenses of sunglasses convex mirror mirror used in headlights of cars and other vehicles concave mirror mirror used in torch light concave mirror mirror used as magnifying concave mirror. A curved mirror is a mirror with a curved reflecting surface. Consequently one uses a converging lens with the object placed. Difference between convex and concave mirror convex vs. Mark the center point p on the curved mirror line and determine the center of curvature for this mirror. How you appear in a concave mirror depends on how close you are to it. Arrange the two meter sticks, mirror, light source, and screen, as shown in figure 2. For converging mirrors and diverging mirrors, the focal length is equal to onehalf the radius.
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