In the shown double-slit setup, one slit is in medium 2 of refractive index n₂ and the other is at its interface with medium 1 of refractive index n₁≠n₂. Their separation d is normal to the interface. A parallel monochromatic beam from medium 1 illuminates the slits. A distant detector in medium 2 is at angle θ to the line joining them, with θ equal to the refraction angle. Which statement(s) is(are) correct?