Final answer:
Microscopes can use constructive interference to enhance contrast and improve resolution, leading to better visibility and differentiation of objects within a specimen.
Step-by-step explanation:
Microscopes can use constructive interference to enhance contrast and improve resolution. This is important because it allows for better visibility and differentiation of objects within a specimen. By superimposing a reference beam of light upon the light emerging from the sample, interference occurs between the light from the background and the objects, resulting in different amounts of constructive and destructive interference. This ultimately produces a greater contrast between objects, making them easier to observe and study.