A Young's double-slit experiment is performed using monochromatic light of wavelength The intensity of light at a point on the screen, where the path difference is , is K units. The intensity of light at a point where the path difference is is given by , where n is an integer. The value of n is __________
Option: 1 9
Option: 2 6
Option: 3 3
Option: 4 12
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