If the fringe width is 0.75 mm, calculate the wavelength of light. Given: Distance between slits = d = 0.8 mm = 0.8 x 10^-3 m = 8 x 10^-4 m. Distance between slit and screen = D = 1.2 m, Fringe width = X = 0.75 mm = 0.75 x 10^-3 m = 7.5 x 10^-4 m.

What is N in fringe width formula?

The separation between two consecutive dark fringes or bright fringes is called the fringe width. Where n is an integer called the order of the fringe and λ is the wavelength of the monochromatic source of light.

What is fringe width?

Fringe width is the distance between two consecutive bright spots (maximas, where constructive interference take place) or two consecutive dark spots (minimas, where destructive interference take place).