Why distance of object in concave mirror {u} is always negative
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Because image form in right side of mirror
Distances measured on the other side are negative. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. … When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. A negative m means that the image is inverted.
Yes because we put object in left side of mirror opposite to light direction , which makes u negative