Hi there, would you please solve in details real quick, that will be helpful and appreciated. I will give you a good feedback too. Thank you

A sheet of glass of n = 1.4 is to be coated with a thin film of a material with n = 1.55 in order that green light of wavelength 525 nm in air will be reflected off of the film and glass via constructive interference. What is the minimum thickness of film that will achieve this result