1. The problem statement, all variables and given/known data An oil film (index of refraction no = 1.48) floating on water (index of refraction nw = 1.33) is illuminated from above by white light at normal incidence. The film is 360.0 nm thick. What is the longest visible wavelength that will be strongly reflected? What is the longest visible wavelength that will be strongly transmitted? 2. Relevant equations 2nt = (m + 1/2)λ--constructive 2tn = m λ, with m = 0,1,2,... 3. The attempt at a solution since visible range=400 - 700 nanometers the longest visible wavelength for constructive interference ...should it be λ=2t/(2+1/2) λ=456.24? and so for the second question i use the second equation?