Final answer:
The student's question involves a lens forming an image at its focal point when the object is at infinity and forming a real image when the object is at 60 cm, both characteristics of a converging lens which indicates that the lens has a positive power.
Step-by-step explanation:
The student's question pertains to the behavior of lenses in terms of image formation and magnification, which is based on the principles of geometrical optics in physics. Specifically, the student is asking about a lens with two given observations: first, when an object is placed at infinity, the image is formed at the focal point (which is characteristic of a converging lens), and second, when an object is placed at 60 cm from the lens, a real image is formed 10 cm on the other side, which also indicates a converging lens due to the positive image distance.
The lens, therefore, has a positive power since converging lenses have positive focal lengths and are associated with positive optical power, which is capable of converging incident rays. The power (P) of a lens is related to its focal length (f) by the formula P = 1/f, where P is measured in diopters (D) and f in meters (m).