One major determining factor is type of light, or particle being observed including "telescopes" that cannot form an image or do not use optics.
Some types of telescopes cannot form an image, and other types do not use optics. One major determining factor is type of light, or particle being observed.
One major determining factor is type of light, or particle being observed. Some types of telescopes cannot form an image, and other types do not use optics.
One major determining factor is type of light, or particle being observed. Some types of telescopes cannot form an image, and other types do not use optics.