The thickness of oil spill can be measured by microwave reflection.  A drone directs microwave beam from above.  The two oil surfaces reflect microwave back to the drone.  The refractive index is 1.5 for crude oil, and 1.34 for sea water.  At one spot, the strongest reflected frequency (zeroth order interference) is 6 GHz.  The oil is _____ mm thick.

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.