Concave lenses are typically used to diverge light rays and can play specific roles in optical devices. Among the choices given, the most accurate statement about the application of concave lenses would be:
"Concave lenses can be used in microscopes to make microscopic objects visible."
While concave lenses can also be used in some optical systems (like eyeglasses for nearsightedness), in this context, the application in microscopes aligns well with their function to enhance visibility and assist in focusing light on small objects. The other options do not accurately represent typical applications of concave lenses.