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A Fresnel bi-prism was used to obtain an interference fringe, the distance between the source and the prism was 30 cm, and the distance between the prism and the barrier was 70 cm.
Find the distance between two consecutive fringes, given that the prism angle is 1, the refractive index of its material is 1.53 , and the wavelength of light is 5000 angstroms.

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