When an object is placed at the center of curvature of a concave mirror, the image formed is real, inverted, and of the same size as the object.
Option 1 - Real and magnified: If the object is shifted 8 cm towards the focus, the image will still be real and inverted, and it will be magnified compared to the original image. This is because as the object moves closer to the focus, the rays of light diverge more and form a larger image. So, option 1 is correct.
Option 2 - Virtual and magnified: Virtual images are formed when the rays of light appear to diverge from a point behind the mirror. Since the image formed by a concave mirror is real when the object is at the center of curvature, option 2 is incorrect.
Option 3 - Real and reduced: When the object is shifted towards the focus, the image formed by a concave mirror will still be real, but it will be magnified, not reduced. Thus, option 3 is incorrect.
Option 4 - Virtual and reduced: Since the image formed by a concave mirror when the object is at the center of curvature is real and not reduced, option 4 is incorrect.
Therefore, the correct answer