6. In the double-slit interference experiment, SS1-SS2, as shown in figure 2.6, the double-slit was illuminated...

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6. In the double-slit interference experiment, SS1-SS2, as shown in figure 2.6, the double-slit was illuminated by monochromatic light with wavelength, and the interference fringes were formed on the screen after passing through air (n 1.0). It is S known that there is a third order bright fringe at point P when the whole device is placed in air, then the optical path difference from S1 and S2 to point P is If the whole device is placed in a transparent liquid medium, point P the fourth order bright fringe, then the refractive index of the medium (n) is " Fig. 2.6 6. In the double-slit interference experiment, SS1-SS2, as shown in figure 2.6, the double-slit was illuminated by monochromatic light with wavelength, and the interference fringes were formed on the screen after passing through air (n 1.0). It is S known that there is a third order bright fringe at point P when the whole device is placed in air, then the optical path difference from S1 and S2 to point P is If the whole device is placed in a transparent liquid medium, point P the fourth order bright fringe, then the refractive index of the medium (n) is " Fig. 2.6

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