A mirror with a dielectric coating (2) on a substrate (3), wherein the dielectric coating (2) has exactly two layer stacks (4, 5), a first layer stack (4), on the substrate, of layers (41, 42) of high refractive index and low refractive index oxides in alternating arrangement and a second layer stack (5), arranged thereon, of layers of fluorides (52) and oxides (51) in alternating arrangement, and wherein the number of fluoride layers (52) as a proportion of the total number of layers of the dielectric coating (2) is less than 0.45.