This is my 3rd time posting, but no one is able to solve itcorrectly. When monoc

Question

This is my 3rd time posting, but no one is able to solve itcorrectly. When monochromatic light shines perpendicularly on a soap film(n = 1.33) with air on each side, the second smallestnonzero film thickness for which destructive interference ofreflected light is observed is 326 nm.What is the vacuum wavelength of the light in nm? The 433.58nm is not an answer....neitheris 702.24nm PLEASE HELP This is my 3rd time posting, but no one is able to solve itcorrectly. When monochromatic light shines perpendicularly on a soap film(n = 1.33) with air on each side, the second smallestnonzero film thickness for which destructive interference ofreflected light is observed is 326 nm.What is the vacuum wavelength of the light in nm? The 433.58nm is not an answer....neitheris 702.24nm PLEASE HELP

Explanation / Answer

YOU ALREADY HAVE THE N= 1.33 AND t2 = 326
2tn/(m+1/2)= 2x326x1.33/(1+.5)    [ use m=1]
      =578.107 nm

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