Only a concave mirror can be used to produce an inverted image; and this only occurs if the object is located at a position of more than one focal length from the concave mirror. Concave Mirror Convex Mirror Image Formation By Concave Mirror Concave Mirror Ray Diagram Image Formation By Convex Mirror. Table 5 shows how the location and character of the image formed in a concave spherical mirror depend on the location of the object, according to Eqs. When the object is placed at infinity, the two rays AB and DE running parallel to the principal axis get reflected at point B and E respectively and intersect each other at the principal focus F on the principal axis. Finally, if the object distance approaches 0, the image distance approaches 0 and the image height ultimately becomes equal to the object height. We use them because we know the paths of them. Starting from a large value, as the object distance decreases (i.e., the object is moved closer to the mirror), the image distance increases; meanwhile, the image height increases. Are all real images larger than the object? 4. Compare and contrast the images formed by concave and plane mirrors. Case 3: The object is located between C and F. When the object is located in front of the center of curvature, the image will be located beyond the center of curvature. Earlier in Lesson 2, the term magnification was introduced; the magnification is the ratio of the height of the image to the height of the object. In this case, the image will be an upright image. A six-foot tall person would have an image that is larger than six feet tall; the magnification is greater than 1. The point of their intersection is the virtual image location. When the object AB is placed at the principal focus, then the parallel ray of light AD passes through the principal focus F giving us the reflected ray DX. Finally, when the object distance is equal to exactly one focal length, there is no image. Identify the means by which you can use a concave and/or a plane mirror to form a virtual image. When the object is placed between the principal focus and the pole. The L of L•O•S•T represents the relative location. Image formed by a concave mirror when the object is placed at infinity. Between the principal focus and pole, 1. Identify the means by which you can use a concave and/or a plane mirror to produce an upright image. At the center of curvature, the object distance equals the image distance and the object height equals the image height. Identify the means by which you can use a concave and/or a plane mirror to produce an inverted image. At the principal focus 6. When the object is located at the center of curvature, the image will also be located at the center of curvature. So, the reflected rays DX and EY are extended backward by dotted lines. © 1996-2020 The Physics Classroom, All rights reserved. Perhaps you noticed that there is a definite relationship between the image characteristics and the location where an object is placed in front of a concave mirror. 6. That is to say, if the object is right side up, then the image will also be right side up. Image Formation by a Concave Mirror. Light rays actually converge at the image location. And the second ray of light AE passing through the centre of curvature C is reflected along the same path forming the reflected ray EY. Finally, the image is a real image. When the object is placed at principal focus. If the object is a six-foot tall person, then the image is less than six feet tall. Explain formation of different types of images by a concave mirror with the help of diagrams. Case 5: The object is located in front of F. When the object is located at a location beyond the focal point, the image will always be located somewhere on the opposite side of the mirror. It would appear to any observer as though light from the object were diverging from this location. On extending backwards, these rays appear to intersect each other at point A’ behind the mirror. It is clear that the modus operandi of a shaving mirror, or a makeup mirror, is to place the object ( i.e. The positive sign here, indicates that the image is virtual, that is the image is formed on the other side of the mirror. Thus a virtual and erect image is formed at 15 cm behind the mirror. The purpose of this portion of the lesson is to summarize these object-image relationships - to practice the L•O•S•T art of image description. As discussed earlier in Lesson 3, light rays from the same point on the object will reflect off the mirror and neither converge nor diverge. Light rays actually converge at the image location. DX and EY become parallel to each other so these rays cannot intersect each other and the image will be formed at infinity. In this case, the absolute value of the magnification is less than 1. CONTENTS CONCAVE MIRROR PARTS OF CONCAVE MIRROR RULES FOR OBTAINING IMAGE FORMED BY CONCAVE MIRROR DIFFERENT TYPES OF IMAGES FORMED BY A CONCAVE MIRROR USES OF CONCAVE MIRRORS 4. The three types of images formed by mirrors (cases 1, 2, and 3) are exactly analogous to those formed by lenses, as summarized in the table at the end of Image Formation by Lenses. C. Beyond the centre of curvature. A concave mirror will only produce an upright image if the object is located in front of the focal point. Plane mirrors never produce inverted images. Perhaps you noticed that there is a definite relationship between the image characteristics and the location where an object is placed in front of a concave mirror. If a sheet of paper were placed at the image location, the actual replica of the object would appear projected upon the sheet of paper. 7. B. D. Between the pole of mirror … When the object AB is placed between the principal focus and the pole, then the parallel ray of light AD passes through the focus F giving us the reflected ray DX. Use complete sentences to explain how Foo is able to accomplish this magic trick. 1. Beyond the centre of curvature 3. When Foo does this, a real image is formed at the same location and of the same size. Thus the image formed is between the principal focus F and centre of curvature C, diminished, real and inverted. The theme of this unit has been that we see an object because light from the object travels to our eyes as we sight along a line at the object. Test Your Understanding and Answer These Questions: Rules for obtaining images formed by spherical mirror, Rules for Obtaining Images by Spherical Mirrors. As such, the image of the object could be projected upon a sheet of paper.

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