Destructive Interference Physics Problem. Any help greatly appreciated!?

What is the thinnest film of a coating with n = 1.42 on glass (n= 1.52) for which destructive interference of the red component (650nm) of an incident white light beam in are can take place by reflection? What is the intensity of the light reflected from the top surface and the interface between the two transparent... show more What is the thinnest film of a coating with n = 1.42 on glass (n= 1.52) for which destructive interference of the red component (650nm) of an incident white light beam in are can take place by reflection? What is the intensity of the light reflected from the top surface and the interface between the two transparent layers?
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