The image formation of a point source is either real, virtual or mixed according to the position of the source with respect to the mirror. Light image formation by concave lens class 10 science ncert. The author presents an elementary theory of image formation by a concave spherical mirror, elaborated for arbitrary angles of incidence and wide beams of rays. An investigation of student understanding of the real image formed by a converging lens or concave mirror. It is converging to the point o, and, if the concave lens had not got in the way, it would have formed a real image at o. This worksheet tasks students with predicting and describing image formation off both convex and concave mirrors. There are two alternative methods of locating the image formed by a concave mirror. Large concave mirrors are used in field of solar energy to focus sun rays on objects to be heated.
Images formed by concave and convex mirrors and determination. There is a definite relationship between the image characteristics and the location where an object is placed in front of a concave mirror. Images formed by curved mirrors official website eiu. Pdf simulated analysis of image formation for concave.
Convex mirrors image characteristics for convex mirrors. The virtual image is formed directly behind the mirror. Based on the law of reflection, three convenient ways of drawing reflected rays from a spherical mirror are established. If a hollow sphere is cut into parts and the outer surface of the cut part is painted.
Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. Image formation with a concave spherical mirror springerlink. Different types of images can be formed by a concave mirror by changing the position of the object from the concave mirror. While clicking on the concave mirror button, a concave mirror, object and its image will be displayed in the window. The surface may be either convex bulging outward or concave recessed inward. Beyond the focus, the object formed a real, inverted, magnified image that became smaller until the image and the object became the same size at the center of curvature. Concave mirrors reflect light inward to one focal point. Used in search light, car lights and telegraphic intermittent lights. Determine focal length and magnification given radius of curvature, distance of.
The various rules employed for obtaining images on a concave mirror are. I have a pdf file that i need to somehow mirror i need the mirror image because i am printing this as an ironon transfer. Remove the mirror and determine the corresponding image points i and i for object points o and o as you did in step b4. Draw a ray diagram to show the formation of a virtual image by a concave mirror. 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. Download fulltext pdf simulated analysis of image formation for concave mirror with scilab by using the concept of calculus article pdf available in journal of physics conference series 1204. Look at the side of the halfscreen that is facing the mirror. A ray of light which run parallel to the principal axis, after reflection, passes through the principal focus f of a concave mirror, or appears to pass through the principal focus of a convex mirror. If the object placed at the center of the mirror, image is also formed at center, real, inverted and with the same size as object.
Simulated analysis of image formation for concave mirror. Principal c optical axis the center of curvature c is the center of the sphere. In a concave mirror, a virtual, upright image formed when the object was behind the focus. Sign convention for lens is similar to that of spherical mirror. I would say a few words about image formation words that are equally valid whether you choose to use the convergence. Pdf on apr 1, 2019, erwin randjawali and others published simulated analysis of image formation for concave mirror with scilab by using the concept of calculus find, read and cite all the. Image formation by curved mirrors a concave cylindrical mirror 1. This line is the image of the line oo in front of the mirror. A convex mirror can only produce a virtual image since all reflected rays will diverge. When an object is placed in front of a concave mirror, and image is formed at a point where at least two reflected rays intersect each other. The purpose of this lesson is to summarize these object image relationships to practice the lost art of image description. Objective the objective of this lab was to verify the lens equation and to observe the formation of images by. Images formed by concave mirror using ray diagram class. Concave mirror a concave mirror is that spherical mirror in which the reflection of light takes place at the concave surface 5.
Concave mirror convex mirror image formation by concave mirror concave mirror ray diagram image formation by convex mirror. Image formation by concave and convex lenses a plus topper. Cbse 2011 we require minimum two rays for locating the image formed by a concave 27. The size of the image is much smaller as compared to that of the object. In an experiment to determine the focal length f of a concave mirror by the uv method, a student places the object pin a on the principal axis at a distance x from the pole p. 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. I dont have that software, so im looking for another, easy option. 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.
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 in concave mirrors concave mirrors. Image formation by concave mirrors richard fitzpatrick. Concave mirrors image characteristics for concave mirrors.
Image formation in concave mirrors while drawing images of the object we benefits from the special rays given above. How are images formed in a concave and convex 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. Apparatus plane mirror with holder, pair of compasses, concave convex cylindrical mirror, scale, protractor.
It might help you to remember this if you think that when you look in a concave mirror, it looks like you are looking into a cave. That is, f f size 12f is positive and d o d o size 12d rsub size 8o f f size 12f, so that we may expect an image similar to the case 1 real image formed by. A real image is formed by the intersection of real light rays. If the ratio of the diameter of the mirror to its radius is at least 2. Rays come parallel to the principal axis and after reflection from the mirror, appear to diverge from focus f behind the mirror. Previously in lesson 3, ray diagrams were constructed in order to determine the general location, size, orientation, and type of image formed by concave mirrors. Beyond the center of curvature, a real, inverted, reduced image formed. The student looks at the pin and its inverted image from a distance keeping hisher eye in line with pa. 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. Image formation by concave mirror reflection of light cbse. Pdf an investigation of student understanding of the real image. Question 1 the image formed by concave mirror is seen to be virtual,erect and larger than the object. Spherical mirrors image formation by concave mirrors there are two alternative methods of locating the image formed by a concave mirror. A highly diminished point sized, virtual and erect image is formed when object is at infinity by a concave lens at principal focus f1.
If a curved mirror is a part of a sphere then it is known as a spherical mirror. Flat mirrors spherical mirrors images formed by refraction thin. Light does not pass through the image object image each point on the image can be determined by tracing 2 rays from the object. Flat mirror concave mirror o c f convex mirror o f c figure 1. Signs are taken left of the optical centre as negative, right of the optical centre as positive, above of the. The image formed is virtual the light does not really pass through the image location. Mar 14, 2018 trick for learning image formation by concave mirror duration.
Convex mirror is also known as diverging mirror and concave mirror is known as converging mirror. To create a real image with a concave mirror, the object must be outside the focal point. Question 2 the image formed by concave mirror is seen to be real,inverted and of same size. Therefore different types of images are formed when the object is placed 1. With a plane flat mirror, this gives the impression of an im. 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. A parabolic mirror has the property that any incident light ray parallel to the principal axis and impinging upon its surface will be reflected through a point called the focus f of the mirror. When an object is placed at infinity, the real image is formed at the focus. Formation of image by a concave mirror in ray diagram duration. Concave mirrors and convex mirrors image formation, ray diagram. Strictly speaking, images arent formed in a mirror, theyre formed by a mirror. Instructors are permitted to make and distribute copies for their classes.
The most common nonspherical type are parabolic reflectors, found in optical devices such as reflecting telescopes that need. Concave and convex lenses image formation curvature. Optics mcq image formation by concave mirror ask physics. Lab6 image formation with convex lenses and concave mirrors. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror. Spherical mirrors are of two types convex and concave. Image formation by mirrors and lenses physics courses. View lab report lab6 image formation with convex lenses and concave mirrors. It serves during examination of the inside of eyes. Following are the rules which are used for obtaining images formed by spherical mirrors. Consider an object placed between the focal point and the mirror, for a concave mirror. Consider the situation shown in, concave spherical mirror reflection, in which an object is placed farther from a concave converging mirror than its focal length. We wish to describe the characteristics of the image for any given object location.
Can we see a real image with our naked eye without using a screen to capture image. The image formed by a plane mirror is always a virtual image as it cannot be obtained. One mark questions convex mirror for seeing traffic at. A ray of light parallel to the principle axis of a concave mirror passes through its principle focus after reflection from the mirror. Concave mirrors and convex mirrors image formation, ray. The ray diagram constructed earlier for a convex mirror revealed that the image of the object was virtual, upright, reduced. The arrangement of pins and mirror on stands are adjusted as shown in figure. The concave mirror on the left forms a real image which is inverted when the object lies outside the focal point. So far, the only thing ive heard is that adobe acrobat the full version has a mirror feature. When a ray, passing through focus strikes concave or convex lenses, the reflected ray will pass parallel to the principal axis. Therefore different types of images are formed when the object is placed.
One mark questions convex mirror for seeing traffic at the. A concave mirror is a mirror that is curved inward in the middle. 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. The first is purely graphical, and the second uses simple algebraic analysis. The surface may be either convex bulging outward or concave bulging inward. Lets start drawing images of the objects located in different parts of the mirror. When parallel lightrays strike a convex mirror they are reflected such that they appear to. A mirror is a surface which reflects a clear image. Lab6 image formation with convex lenses and concave. It consists of a concave mirror two pins and three stands for pins and the mirror.
Image is point sized, highly diminished, virtual and erect. The physics classroom grants teachers and other users the right to print this pdf document and to download this pdf document for private use. A curved mirror is a mirror with a curved reflecting surface. Previously in lesson 4, ray diagrams were constructed in order to determine the location, size, orientation, and type of image formed by concave mirrors. Students must then look back and make associations with image formation based upon type of mirror and the location of the object relative to the center of curvature and focal length. Used in mirror telescopes its front is a silverplated mirror the spherical concave mirror finds its most valuable application as eye mirror helmholtz 1851. 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. Spoon here acts as a concave mirror and the image is inverted. Image formation convex vs concave one side will be concave and the other will be convex. Introduction a concave spherical mirror is an approximation of a parabolic mirror. The one basic principle is that light that hits a mirror reflects at the same angle with which it hits. A concave mirror, or converging mirror, has a reflecting surface that is recessed inward away from the incident light. Image formation by concave mirror reflection of light. Exploring concave mirror images the pdf file below accompanies the concave mirror image formation interactive.
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. Explain with ray diagrams the formation of an image using spherical mirrors. Nov 24, 2015 image formation by concave mirror reflection of light cbse grade. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. Thus far we have seen via ray diagrams that a real image is produced when an object is located more than one focal length from a concave mirror. Conceptualization of real image formation by concave. This is the way a makeup mirror or a shaving mirror works. Class 10 science chapter 10 light reflection and refraction. Also, we all know that virtual image formation in a concave mirror will be always erect. Lenses and mirrors focal length of a mirror, image formation by mirrors, thin lenses, image formation with lenses, pdf file. The convex mirror on the right forms a virtual image which is not in. Students will be able to draw ray diagrams for convex and concave mirrors and distinguish between real and virtual images grade quiz practice.
1496 1541 1589 1262 1422 690 1033 648 588 200 139 1401 883 1597 22 1349 579 982 329 1374 1040 383 647 427 751 611 1550 1596 267 1015 980 43 688 248 320 189 601 397 280 629 916 264 77 759 873 1111