Light of wavelength λ = 500 nm falls on two narrow slits placed at a distance d = 50 × 10–4 cm apart, at an angle φ = 30º relative to the slits shown in figure. On the lower slit a transparent slab of thickness 0.1 mm and refractive index 3/2 is placed. The interference pattern is observed on a screen at a distance D = 2m from the slits. Then calculate
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θ = 30º, –49, 
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