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The image distance \(d_i\) is positive for real images and negative for virtual images. The focal length is positive for 'real focal points'--meaning light *actually* converges at the focal point, and is negative for 'virtual focal points'--light only *appears* to converge at a focal point. Focal length of a concave mirror is positive or negative Ask for details ; Follow Report by Aankushgoswami 3 weeks ago Log in to add a comment What is the focal length of a concave mirror ? Following are the ways to obtain the focal length of the concave mirror: A concave mirror is defined as the spherical mirror whose reflecting surface is curved inwards and follows laws of reflection of light. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. The light rays coming from a distant object can be considered to be parallel to each other. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. By obtaining the Real image of a distant object at its focus, the focal length of the concave mirror can be estimated as shown in the diagram. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. The focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. The same can also be proved by using the mirror formula: (1/f = … Its focal length is negative. is it positive or negative? explanation please Get the answers you need, now! That is why U is always taken as negative. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. In case of mirror the f is taken as negative if it is in -X side i.e., is in Concave mirror and taken as positive if it is in +X side i.e., is in Convex mirror. For focal length, f in lens is always taken as negative for concave and positive for convex. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. Notice that rule 1 means that the radius of curvature of a spherical mirror can be positive or negative. As a result, the focal length is positive for converging/concave mirrors and negative for convex/diverging mirrors. How to find focal length of concave mirror? Reason- as per sign convention, all the distances in the direction of incident rays are considered to be positive and distances against the incident ray are negative _____)_____ <-Negative Positive -> here if the bracket represents the concave mirror the the distances are measured in … The focal length \(f\) is positive for concave mirrors and negative for convex mirrors.

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