A parallel coherent beam of light falls on fresnel biprism of refractive index \( \mu \) and ang...

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A parallel coherent beam of light falls on fresnel biprism of refractive index \( \mu \) and angle \( \alpha \). The fringe width on a screen at a distance \( D \) from biprism will be (wavelength \( =\lambda \) )
(a) \( \frac{\lambda}{2(\mu-1) \alpha} \)
(b) \( \frac{\lambda D}{2(\mu-1) \alpha} \)
(c) \( \frac{D}{2(\mu-1) \alpha} \)
(d) None of these
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