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Red light with wavelength 600[nm] is incident from air (n = 1.0) onto a thin film...

Red light with wavelength 600[nm] is incident from air (n = 1.0) onto a thin film of index n = 1.5. The thin film coats a thick slab of material which has index n = 2.0.  

1: For what minimum film thickness would the thin film produce no significant overall reflection due to destructive interference?
2: Did the reflections off of those two interfaces have the same phase change (both 0º or both 180º)? Or did the reflections off of those two interfaces have different phase changes (one 0º and the other 180º)?

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