write the mathematical form of mirror
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The mirror equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f). ... These two equations can be combined to yield information about the image distance and image height if the object distance, object height, and focal length are known.
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Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.
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