In Young's double-slit experiment, both the slits produce equal intensities on a screen. A 100% transparent thin film of refractive index 
= 1.5 is kept in front of one of the slits, due to which the intensity at the point O on the screen becomes 75% of its initial value. If the wavelength of monochromatic light is 720 nm, then what is the minimum thickness (in nm) of the film?
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240
The path difference at the point O is
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