Final answer:
Parallel rays entering a converging lens converge at the focal point on the other side of the lens, which is the lens's focal length away from its center.
Step-by-step explanation:
Parallel rays entering a converging lens will be seen to converge at the focal point on the other side of the lens. When parallel light rays are incident on a converging lens, they refract and meet at a single point known as the focal point. The distance from the center of the lens to the focal point is the lens's focal length. Lenses have the same focal length on either side; therefore, the correct answer to the question is option d) At the focal length on the other side of the lens.