In a Young'* double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is:
(1) 6.9 mm
(2) 5.9 mm
(3) 4.9 mm
(4) 3.9 mm
