A Young’s double-slit apparatus operates in air with light of wavelength 500nm. The slit separation is 0.30mm and the screen is 1.2m from the slits.
(a) Calculate the initial fringe width on the screen.
(b) The whole arrangement is then completely immersed in water of refractive index 1.33. Determine the new fringe width produced on the same screen kept at the same position.
(c) State whether the central bright fringe shifts its position when the apparatus is immersed and give a brief reason for your answer.