5) What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n 1.46) if the film is 214 nm thick? lambda' = lambda/n there is a shift in wavelength in thin films. You need to use lambda' and use with thickness for path difference path difference 2t

5) What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n 1.46) if the film is 214 nm thick? lambda' = lambda/n there is a shift in wavelength in thin films. You need to use lambda' and use with thickness for path difference path difference 2t