mean: a double-slit interference experiment is set up in a laboratory using a source of blue monochromatic light of wavelength 475 nm.the separation of two slit is 0.40mm and the distance from the slit to the screen where the fringes are observed is 2.20m

Answer 1

Isn't there a standard formula for this? You have to convert separation and distance from the slits to an angle, but geepers, that is not onerous.