A concave mirror forms a real image at the same position as the object. If its radius of curvature is 50 cm, the object distance is:
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A concave mirror forms a real image at the same position as the object. If its radius of curvature is 50 cm, the object distance is:

G1 Physics · Accepted Answer

Object and image coincide at the centre of curvature, so |u|=R=50 cm.