In Fresnel’s biprism expt., a mica sheet of refractive index
1.5 and thickness 6 × 10⁻⁶ m is placed in the path of one of
interfering beams as a result of which the central fringe
gets shifted through 5 fringe widths. The wavelength of
light used is
(a) 6000 Å (b) 8000 Å
(c) 4000 Å (d) 2000 Å
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