Images formed by concave mirror using ray diagram class 10. Cbse class 10 science lab manual image formation by a. What happens if an object is closer to a concave mirror than its focal length. This is analogous to a case 2 image for lenses d o image of an object placed close to a concave mirror. Pdf an investigation of student understanding of the real image. Lets start drawing images of the objects located in different parts of the mirror. Depending upon the position of the object, image formed by a concave mirror could be real or virtual and could also be magnified or diminished. This is explained with the help of ray diagrams as follows. Image formation by concave mirror reflection of light. The following table illustrates the image formed by a concave mirror for different positions of the given object. When the object is placed at infinity, rays pq and rs parallel to the axis are reflected from points q and s respectively.
To study the nature of images formed by convex and concave mirrors. To discover the relationships among object position, image position, focal length, magnification, and. Do this by repeating your measurements by placing the concave mirror at 810 locations along the bench. For a real object very far away from the mirror, the real image is formed at the focus. Does it differ from that seen in the image formed by the lens. Image formation by a convex mirror if the mirror is convex, so that r is negative, the resulting image is virtual that is, the image point is on the opposite side of the mirror from the object, erect, and smaller than the object. Now, lets study the types of images formed by a convex mirror 1. Reflection and image formation by mirrors purpose a. Question 5 where should an object be placed in front of a concave mirror so as to obtain image between f and c.
Concave mirrors and convex mirrors image formation, ray diagram. From p, the distance opposite to incidence ray is measured in negative. Concave mirror image formation for each mirror and letter object below, construct ray diagrams for each marked dot to show the location and appearance of the image. That is, f is positive and d o f, so that we may expect an image similar to the case 1 real image formed by a converging lens. Image formation by a concave mirror for different positions of the object is shown below in the table concave mirrors are used as shaving mirrors, reflectors in car headlights, hand torch and table lamps. Concave mirror convex mirror image formation by concave mirror concave mirror ray diagram image formation by convex mirror. This is analogous to a case 2 image for lenses d o 2f image is real, inverted, and smaller than object telescope real image. Spherical mirrors there are two alternative methods of locating the image formed by a concave mirror. This one factor allows a very large usage of convex mirrors. A concave shaving mirror has a focal length of 33 cm. We wish to describe the characteristics of the image for any given object location.
Cbse class 10 science lab manual image formation by a convex lens experiment 8a aim to find the image distance for varying object distances in case of a convex lens. There is a definite relationship between the image characteristics and the location where an object is placed in front of a concave mirror. Image formation by mirrors and lenses physics courses. Nature of images in a convex mirror and its applications. These are used in scooters, cars, buses and trucks to see the rear view, as the images formed are diminished, so. Consider the situation shown in figure 4, concave spherical mirror reflection, in which an object is placed farther from a concave converging mirror than its focal length.
Image formation by concave mirror reflection of light cbse grade. When the object is placed at principal focus f of a concave mirror, a highly enlarged image is formed at infinity. Large concave mirrors are used to concentrate sunlight to produce maximum heat in the solar furnaces. An investigation of student understanding of the real image formed by a converging lens or concave mirror. Image formation by concave image formation by convex mirrors the definitions of the principal axis, centre of curvature, radius of curvature, and the vertex, of a convex mirror are analogous to the corresponding definitions for a concave mirror. Light image formation by concave mirror class 10 science. A summary of the three cases or types of image formation appears at the end of this section. The image can be real or virtual, erect or inverted and magnified, diminished or of the same size as that of the object, all depending on the position of the object. This line is the image of the line oo in front of the mirror. For a concave mirror, there are six possible positions where the object can be positioned and an image is formed. Concave and convex mirrors ray diagram for convex and.
If youre seeing this message, it means were having trouble loading external resources on our website. A mirror is a surface which reflects a clear image. Image formation by a convex mirror if the mirror is convex, so that r is negative, the resulting image is virtual that is, the image point is on the opposite side of. We look at the image formation by these spherical lenses using ray diagrams. While clicking on the concave mirror button, a concave mirror, object and its image will be displayed in the window. Aug 31, 2016 image formed by a spherical mirror experiment. Mar 03, 2019 convex and concave lenses are spherical lenses. Question 4 write the applications of concave mirror. Draw your rays lightly but visibly and mark your image points boldly.
Compared to other reflective mirrors, the field of view for a convex mirror is the maximum. Draw a ray diagram to illustrate image formation in this case and also mark the distances on it. Image formation by convex and concave lens ray diagrams. Image formation by concave mirror reflection of light cbse. First make sure that image formation by a spherical mirror is involved. The focal length f of a concave mirror is positive, since it is a converging mirror. Therefore, it covers are a larger field of view compared to a plane or concave mirror. Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case. Nov 24, 2015 image formation by concave mirror reflection of light cbse grade. Pdf the properties of real and virtual images formed by lenses and mirrors are. Explain with ray diagrams the formation of an image using spherical mirrors. Take the sheet of white paper and fold it about two or three times to make a screen. The image formed by a concave mirror varies in size depending on the position of the object with respect to the mirror.
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. Image 2 is a single reflection image from mirror 2. Question 6 where should an object be placed in front of a concave mirror so as to obtain image beyond c. Concave mirror is also used by dentists, to see the large images of the teeth of patients. Images formed by concave mirror using ray diagram last updated on march 20, 2019 by mrs shilpi nagpal 19 comments question 1 the image formed by concave mirror is seen to be virtual,erect and larger than the object. An image which can be formed on the screen is known as real image and the one which cannot be formed on screen is known as a virtual image. You will exercise and study the image formation by plane mirrors fig. For a real object close to the mirror but outside of the center of curvature, the real image is formed between c and f. There are two alternative methods of locating the image formed by a concave mirror. We can see and photograph virtual images only by using an additional lens to form a real image. The image is upright and larger than the object, as seen in figure 10b, and so the lens is called a magnifier. To learn to distinguish between real and virtual images. The distance between the object and its inverted image formed by a concave mirror is 25cm.
The virtual image produced by a concave lens is always smaller than the objecta case 3 image. When an object is placed at infinity, the real image is formed at the focus. An object a b is kept in front of a concave mirror as shown in the figure. Based on the law of reflection, three convenient ways of drawing reflected rays from a spherical mirror are established. Flat mirrors spherical mirrors images formed by refraction thin. Mar 20, 2019 images formed by concave mirror using ray diagram last updated on march 20, 2019 by mrs shilpi nagpal 19 comments question 1 the image formed by concave mirror is seen to be virtual,erect and larger than the object. Concave mirrors and convex mirrors image formation, ray.
Image formation by concave mirrors richard fitzpatrick. Plane mirrors produce images that are upright, virtual and of the same size as. This is because the rays of light falling parallel once reflected diverge. The first is purely graphical, and the second uses simple algebraic analysis.
Large concave mirrors are used in field of solar energy to focus sun rays on objects to be heated. To create a real image with a concave mirror, the object must be outside the focal point. Spherical mirrors image formation by concave mirrors there are two alternative methods of locating the image formed by a concave mirror. For a real object between f and the mirror, a virtual image is formed behind the mirror.
This is shown in slide 25 user can change the position of the object along the principal axis of the concave mirror by clicking the bottom of the object and. When parallel lightrays strike a convex mirror they are reflected such that they appear to. A plane mirror will always produce an upright image. The analytic method described below is far more flexible. Jan 24, 20 can we see a real image with our naked eye without using a screen to capture image. Virtual images are larger than the object only in case 2, where a convex lens is used. Only consider rays making a small angle with the principal axis. Use a carefully drawn ray diagram to describe the image produced by a concave mirror with focal length of f 20 cm when an object is 15 cm away from the mirror. Determine whether ray tracing, the mirror equation, or both are required. Multiple reflections a person is sitting in front of two mirrors that intersect at a right angle.
Image formation by mirrors and lenses chapter outline 26. Class 10 science chapter 10 light reflection and refraction. Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. Only a concave mirror can be used to produce an inverted image. Calculate the image position of a cologne bottle placed in front of the mirror at a distance of 93 cm. Image formation by concave mirrors university of texas. Materials required a thin convex lens, a lens holder fitted in a stand, a piece of rice paper screen fixed to a stand, a. Therefore different types of images are formed when the object is placed. To discover the relationships among object position, image position, focal length, magnification, and the radius of. The size of the image is much smaller as compared to that of the object. To discover the relationships among object position, image position, focal length, magni. First of all, the rough focal length of the mirror is found out by focusing a distance object on wall or in paper and measuring the distance between the mirror and sharp image. The image formed in a convex mirror is always virtual and erect, whatever be the position of the object. Apparatus plane mirror with holder, pair of compasses, concave convex cylindrical mirror, scale, protractor.
Images formed by concave mirror using ray diagram class. The purpose of this lesson is to summarize these objectimage relationships to practice the lost art of image description. Spoon here acts as a concave mirror and the image is inverted. Remove the mirror and determine the corresponding image points i and i for object points o and o as you did in step b4. The imaging properties of a concave mirror are similar to that of a lens so we can repeat our procedure for sampling the relation between image and object distance. It consists of a concave mirror two pins and three stands for pins and the mirror. The graphical method described above is fine for developing an intuitive understanding of image formation by concave mirrors, or for checking a calculation, but is a bit too cumbersome for everyday use. Uses of convex mirror image formation on a convex mirror. Pdf optical images due to lenses and mirrors researchgate.
The graphical method of locating the image produced by a concave mirror consists of drawing lightrays. If the magnification produced by the mirror is 2, use mirror formula to determine the object distance, image distance and focal length of the mirror. The image can form either on the same side as the human in which case it is called a real image or on the side opposite. A sketch is very useful even if ray tracing is not specifically required by the problem. Identify the means by which you can use a concave andor a plane mirror to produce an inverted image.
Light ray rules for convex lens and concave lens are discussed. Also, we all know that virtual image formation in a concave mirror will be always erect. Formation of images by concave mirror uses of spherical mirrors. Image 1 is a single reflection image from mirror 1. Concave and convex lenses image formation curvature. Image formation by curved mirrors a concave cylindrical mirror 1. Curved mirrors concave and convex linkedin slideshare. The position of the image is found by tracing the reflected rays back behind the mirror to where they meet. F ray diagrams for concave mirrors two principal rays are sufficient to find image, use third and fourth to check. Image formation by plane and spherical mirrors purpose to become familiar with the nature of the images formed by plane and spherical mirrors.
Image formation in concave mirrors while drawing images of the object we benefits from the special rays given above. Different types of images can be formed by a concave mirror by changing the position of the object from the concave mirror. The formation of images by a plane mirror conceptual example. Concave mirror, convex mirror, a sheet of white paper, a welllit window, and adhesive tape. Characteristics of the image formed by a concave mirror according to the position of the object when the object is at infinity in the case of a concave mirror, the image formed has the following properties. Flat mirror concave mirror o c f convex mirror o f c figure 1. In mirrors, images are formed through reflection but lenses form images through refraction. Therefore, in this case the image is formed at the. When a ray, passing through focus strikes concave or convex lenses, the reflected ray will pass parallel to the principal axis. A convex mirror can only produce a virtual image since all reflected rays will diverge. The arrangement of pins and mirror on stands are adjusted as shown in figure. Image formation by a concave mirror memorial university of. Formation of image by a concave mirror in ray diagram duration. A concave mirror will only produce an upright image if the object is located in front of the focal point.
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