Final answer:
When the actual focal spot size increases, the effective focal spot size also increases, impacting the sharpness of the image in X-ray systems.
Step-by-step explanation:
As the actual focal spot size increases, the effective focal spot size increases as well. In the context of X-ray production, the size of the focal spot is crucial for the sharpness of the image. A larger actual focal spot size tends to lead to a larger effective focal spot, resulting in a less sharp image. However, there are techniques in X-ray systems, like the line-focus principle, that allow for a smaller effective focal spot compared to the actual size, enhancing image resolution.