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A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image distance and image height.


An object 0.4m tall is placed 2.5m in front of a convex mirror that has a focal length of -90cm. Calculate image distance and image height.


    In each case use the mirror formula

    1/do + 1/di = 1/f

    do = object distance
    di = image doistance

    Make sure you use negative f for the convex mirrors. The image height is di/do times the object heeight.



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