And v is only negative when the image is on the same side of the lens as the object. Its example can be any object that we can magnify. Example Problem #1 A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a concave mirror having a focal length of 15.2 cm. A mirror formula can be defined as the formula which gives the relationship between the distance of object ‘u’, the distance of image ‘v’, and the focal length of the mirror ‘f’. In magnification, I keep on confusing the signs. Generally the convex mirror has magnification greater than 1 and magnification of concave mirror has less than 1. m = -v / u. The linear magnification (m) of mirror can also be calculated in terms of image distance (v) and object distance (u), if we do not know the size (height) of object and image. A graph of uv against u+v; From the mirror formula, we have; 1/f=1/u + 1/v =(v+u)/uv. Most noteworthy, in this way the magnification expression will be: m = h’ / h = -v / u. Question. From what I understand currently, magnification is positive when the image is erect. Thus If v is the distance of image from the mirror or lens and u is the distance of the object from the mirror or lens and f is the focal length of the mirror or lens then Mirror formula: 1/v+1/u=1/f Lens formula: 1/v-1/u… Substituting in the mirror formula, we obtain; 1/f=1/u i.e the x-intercept is equal to 1/f. Vice versa, magnification is negative when the image is inverted, therefore a real image. Answer: The magnification is 1 Explanation: Magnification is defined as ratio to a image height to object height, which can be mathematically proven to be same as ratio of image distance to object distance.. Magnification of a mirror is used in many cases. As a demonstration of the effectiveness of the mirror equation and magnification equation, consider the following example problem and its solution. If the value of magnification is more than 1, then the image formed is enlarged, and if the value of magnification is less than 1, then the image formed is diminished. Example of magnification. Vice versa, magnification is negative when the image is inverted, therefore a real image. Solved Question for You. Let AB be an object placed on the principal axis of a convex mirror of focal length f. u is the distance between the object and the mirror and v is the distance between the image and the mirror. Determine the image distance and the image size. convex mirror formula But DE = AB and when the aperture is very small EF = PF. However using the equation m = v/u, m is negative when v is negative. The mirror formula is applicable for both, plane mirrors and spherical mirrors (convex and concave mirrors). An image is only erect when it is a virtual image, therefore virtual images = positive magnification. 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