Interference of Light: Explaining Transparency & Opacity

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hey found this question in my textbook...
explain using interferance why a super thin film is transparent or invisible in transmitted light but seems to be opaque when viewed with reflected light. Draw a diagram for your solution. any ideas?? i really have no idea. thanks for your time though.
 

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HINT: How much reflected light would there be if all the light were transmitted? :)
 
if all the light went through wouldn't it be "invisible" but how could it be opaque?, like i guess some reflected rays and incident rays would create destructive interferance, but wouldn't you still be able to see through?
 
Think of what your looking for. (Light that's reflected back or light that goes through)