The Fresnel biprism is used to obtain fringes from a point source that is placed 2 m from the screen, and the prism is midway between the source and the screen. Let the wavelength of the light be λ0 = 500 nm and the index of refraction of the glass be n = 1.5. What is the prism angle, if the separation of the fringes is 0.5 mm?
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