A double slit of separation 0.85 mm is arranged so that its plane is normal to a beam of laser light of wavelength 640 nm. Coherent light emerges from the slits and an interference pattern is observed on a screen, which is parallel to the plane of the double slits at a distance of 2.4 m. What is the separation of the bright fringes in the interference pattern on the screen, which is parallel to the plane of the double slits at a distance of 2.4 m.
What is the separation of the bright fringes in the interference pattern on the screen.