In a laboratory experiment, two slits separated by 0.20mm are illuminated by light of wavelength 580nm. The fringes are observed on a screen placed 1.2m away.
(a) Determine the total number of complete bright fringes that can be accommodated within a strip of width 3.0cm on the screen, centred about the central bright fringe.
(b) Calculate the distance of the last bright fringe inside this strip from the central bright fringe.
(c) If the screen is moved 0.30m closer to the slits, how many complete bright fringes will now fit inside the same 3.0cm strip?