You’re a biologist studying rhinoviruses, which cause the common cold. These are among the smallest viruses, some 50 nm in diameter, and you can’t image them with your optical microscope using visible light (average wavelength about 560 nm). A sales rep tries to sell you an expensive microscope using 280-nm ultraviolet light, saying it will resolve structures half the size that’s resolvable with your current microscope. Is the rep correct? Will the new microscope resolve your rhinoviruses?