Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.35) on flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength 2 = 560 nm, a wavelength which is near the middle of the visual spectrum.

Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.35) on flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength 2 = 560 nm, a wavelength which is near the middle of the visual spectrum.