Notice that rule 1 means that the radius of curvature of a spherical mirror can be positive or negative. The focal length \(f\) is positive for concave mirrors and negative for convex mirrors. 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. 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. 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 … 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. As a result, the focal length is positive for converging/concave mirrors and negative for convex/diverging mirrors. explanation please Get the answers you need, now! is it positive or negative? When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. 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. The light rays coming from a distant object can be considered to be parallel to each other. The same can also be proved by using the mirror formula: (1/f = … 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 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. What is the focal length of a concave mirror ? How to find focal length of concave mirror? The image distance \(d_i\) is positive for real images and negative for virtual images. Its focal length is negative. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. That is why U is always taken as negative. For focal length, f in lens is always taken as negative for concave and positive for convex. 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 focal length, is positive for a concave mirror, and negative for a convex mirror. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright.

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