A double slit S1 – S2 is illuminated by a coherent light of wavelength λ . The slits are separated by a distance d. A plane mirror is placed in front of the double slit at a distance D1 from it and a screen Σ is placed behind the double slit at a distance D2 from it (Figure). The screen Σ receives only the light reflected by the mirror. Find the fringe-width of the interference pattern on the screen.
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λ (2D 1 + D 2 ) / d
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