Linear magnification produced by a concave mirror may be:(a) less than 1 or equal to 1 (b) more than 1 or equal to 1(c) less than 1, more than 1 or equal to 1 (d) less than 1 or more than 1

Linear magnification produced by a concave mirror may be less than 1, more than 1, or equal to 1, as it can form images which are smaller than the object (when object is between the focus, F and the centre of curvature, C), equal to the object (when object is at the centre of curvature, C), or bigger than the object (when object is beyond the centre of curvature, C).