Light of wavelength 650nm falls on two slits separated by 0.40mm. The screen is kept 2.0m away from the slits.
(i) Obtain the expression for the fringe width β for this arrangement.
(ii) Using your result, calculate the distance between the 3rd bright fringe and the 5th bright fringe on the same side of the centre.
(iii) If the experiment is now performed in water of refractive index 4/3 (all geometrical distances remaining unchanged), find the new value of the distance calculated in part (ii).