Option 1: The statement that the image will be virtual is correct. In the case of a concave mirror, when the object is placed between the principal focus and the pole of the mirror, the image formed is virtual. This means that the light rays do not actually converge at a point to form a real image. Instead, the rays appear to diverge from a specific point behind the mirror, creating a virtual image.

Option 2: The statement that the image will be enlarged or magnified is also correct. When the object is placed between the principal focus and the pole of the concave mirror, the image formed is magnified compared to the size of the object. This is because the light rays from the object diverge and then converge, creating an enlarged image.

Option 3: The statement that the image will be formed at infinity is incorrect. In the case described, the image formed is not at infinity but rather behind the mirror. The image appears to be located at a specific point behind the mirror, but it is not at an infinite distance.

Option 4: The statement that the image will be erect is correct. When the object is placed between the principal focus and the pole of the concave mirror, the image formed is erect. This means