In: Physics
calculate the minimum thickness needed for an antireflective coating (n=1.39) applied to a glass lens in order to eliminate blue (470nm) reflections for light at normal incidence.
calculate the minimum thickness needed for an antireflective coating (n=1.39) applied to a glass lens inorder to eliminate red (695 nm) reflections for light at normal incidence.
1) lmin = 470 *10^-9/4*1.39 = 8.45 *10^-8 m
2) lmin = 695 *10^-9/4*1.39 = 1.25 *10^-7 m