Final answer:
Increasing scan line density leads to improved spatial resolution, as explained by the example of a microscope.
Step-by-step explanation:
Increasing scan line density leads to improved spatial resolution.
This concept can be explained using the example of a microscope. When the scan line density is increased, more diffraction modes are collected, resulting in a larger cone of light that can be brought into the lens. As a result, the microscope has more information to form a clear image, leading to higher resolving power.