1. The problem statement, all variables and given/known data A transparent film (n = 1.5) is deposited on a glass lens (n = 1.65) to form a nonreflective coating. What is the minimum thickness that would minimize reflection of light with wavelength 500 nm in air? 2. Relevant equations 2nt = mλ n = refractive index of film t = thickness of film m = 1, 2, 3, … λ = light wavelength in vacuum (air) 3. The attempt at a solution I am understanding how to find values for similar questions using the above equation, but get lost when asked about finding the "minimum thickness". I do not see any "tmin" type equations. Any help greatly appreciated. Thanks in advance!