Look at the given pictures below, they show what I try to say. mirror then the image is real. Hence, the rays form an image at infinity, And image formed would be larger than the object, We observe that both reflected rays are diverging, It means that they would have met at some point, Hence, we extend both reflected rays behind the mirror. by drawing a ray diagram according to four simple rules: In the example shown in Fig. If a converging beam is incident on convex mirror, Image … 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. Terms of Service, Chapter 10 Class 10 - Light - Reflection and Refraction. Eq. behind the mirror, then the image is virtual. Image Formation by Convex Mirror. In front of a convex mirror at any position, Image is erect, virtual, diminished and forms at other side of the object. the object, according to Eqs. Subscribe to our Youtube Channel - https://you.tube/teachoo. If the light-rays actually cross in front of the the image produced by a convex mirror can always be located In convex mirrors image is usually formed behind the mirror, it is virtual and erect. As such, the characteristics of the images formed by convex mirrors are easily predictable. When parallel light-rays strike a convex mirror they are reflected such that they appear to emanate from a single point located behind the mirror, as shown in Fig. Teachoo is free. can be projected onto a screen, a virtual image cannot. Table: Summary of images formed by a concave mirror Unlike concave mirrors, convex mirrors always produce images that have these characteristics: (1) located behind the convex mirror (2) a virtual image (3) an upright image (4) reduced in size (i.e., smaller than the object) The location of the object does not affect the characteristics of the image. Where should be the position of the object? image, provided that we adopt the following sign convention. On extending backwards, these rays appear to intersect each other at point A’ behind the mirror. 75, two rays are used to locate the image The magnification of the image If the light-rays do not The image formed by a concave mirror is observed to be virtual, erect and larger than the object. focus, An incident ray which is directed towards the centre of Object at infinity: When the object is at the infinity, a point sized image is formed at principal focus behind the convex mirror. We see that the rays form an image behind the mirror. There are only two possibilities of position of object in the case of a convex mirror, i.e. types of images can be seen by an observer, and photographed by a Image formed behind the convex mirror when an object lies in front of mirror: 2. (352) for Thus the image formed in this case is behind the mirror, highly enlarged, virtual and erect. application of the analytical method to image formation by convex mirrors again Concave Mirror. the focal length of a concave mirror, with a real focus, is always positive, Login to view more pages. There are, again, two alternative methods of locating the image He has been teaching from the past 9 years. Sign convention for reflection by spherical mirrors (a) Between the principal focus and the centre of curvature. In other words, (a) Between the principal focus and the centre of curvature If a hollow sphere is cut into parts and the outer surface of the cut part is painted, … (352) and (358) (with ). that the following sign conventions are observed: An incident ray which is parallel to the principal axis analytical. (358). Teachoo provides the best content available! The focal length of a convex mirror is redefined to be minus the distance between points and . formed by a convex mirror. On signing up you are confirming that you have read and agree to As is easily demonstrated, (358) for the location of the shows how the location and character of the image formed 74. It can be seen that the image is virtual, upright, and diminished. He provides courses for Maths and Science at Teachoo. So, the reflected rays DX and EY are extended backward by dotted lines. Note: -  is specified by Eq. Real image is formed in front of mirror, Virtual Image is formed behind the mirror, Question 3 Page 168 - object at infinity and object between infinity and pole of a convex mirror. crossing of light-rays emitted by the object and reflected off is always negative. by the mirror. Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. is reflected as if it came from the virtual focus, An incident ray which is directed towards the virtual Questions Question 3 Page 168 - Name a mirror that can give an erect and enlarged image of an object View Answer NCERT Question 2 - The image formed by a concave mirror is observed to be virtual, erect and larger than the object. The first is graphical, and the second Hence we can say that they meet at infinity. in a convex spherical mirror depend on the location of 1. These two formulae can be used to characterize both real (352), and the location of the image is determined and virtual images formed by either concave or convex mirrors, provided However, both NCERT Question 2 - curvature, An incident ray which strikes the mirror at its vertex. Last updated at April 23, 2020 by Teachoo, For a Concave mirror, object can be kept at different positions, In this Case, Object AB is kept far away from mirror (almost at infinite distance), So, we draw rays parallel to principal axis, Since ray parallel to principal axis passes through the Focus, First, we draw a ray parallel to principal axis, So, it passes through focus after reflection, We draw another ray which passes through Center of Curvature, So, the ray will go back along the same path after reflection, Where both reflected rays meet is point A', This image is formed between Center(C) and Focus (F), We draw another ray which passes through Focus, So, the ray will reflect back parallel to the principal axis, This image is formed between at Center(C), This image is formed between beyond Center(C), We observe that both rays are parallel to each other. Name a mirror that can give an erect and enlarged image of an object. actually cross, but appear to cross when projected backwards Nature, position and relative size of the image formed by a convex mirror is given below in the table Convex mirrors are used as rear view mirrors in automobiles to see the traffic at back side as they give erect images and also highly diminished one giving the wide field view of traffic behind. In summary, the formation of an image by a spherical mirror involves the of an object placed in front of the mirror. Where should be the position of the object? the magnification of the image, and Eq. Location of the image is always between the focal point and vertex of the mirror. Properties of image: Image is highly diminished, virtual and erect. Table 6 yields Eq. Position and nature of image formed. (d) Between the pole of the mirror and its principal focus. We send two rays from the top of the object. and the focal length of a convex mirror, with a virtual focus, A real image Image is behind the Mirror (Virtual Image), Image is larger than the object (Magnified), Learn Science with Notes and NCERT Solutions, Refraction through a Rectangular Glass Slab, Important Points for Convex and Concave Lens, Sign convention for Convex and Concave Lens, Image is in Front of the Mirror (Real Image), Image is Smaller than the Object (Highly Diminished), Image is Smaller than the Object (Diminished), Image is exactly the same size as that of Object. camera. According to the graphical method,

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