1. The problem statement, all variables and given/known data To reduce reflections from glass lenses (n ≈ 1.5), the glass surfaces are coated with a thin layer of magnesium fluoride (n ≈ 1.39). What is the correct thickness of the coating for green light (510 nm vacuum wavelength)? 2. Relevant equations [tex]\lambda[/tex] = 2nd/(m+1/2) 3. The attempt at a solution I don't really know where to start. It says "correct thickness"...what defines the correct thickness? Is it when a certain value is 0? Or when a certain amount of light gets through? I'm confused as to where to start because I'm not sure what this means...if anyone could give me a hint, that would be awesome. Thanks.