In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be 

(1) 0.2 mm

(2) 0.3 mm

(3) 0.4 mm

(4) 1.2 mm

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