Magnification is -1 what type of mirror is it and the position of the image and the nature of the image is -
Since the magnification is -1 so the image must be of the same size as that of the object.
Since the image size = object size
So the object must have been kept at the center of curvature of the spherical mirror.
Since the magnification is negative, the image is real, inverted, and can be obtained on the screen.