The intensity is greatest at the centre of the central fringe.The central fringe is twice as wide as the outer fringes.The peak intensity of fringes decreases with distance from the centre.The outer fringes are less intense than the central fringe.
The greater the wavelength the wider the fringes.The narrower the slit the wider the fringe.
The greater the wavelength the wider the fringes.The narrower the slit the wider the fringe.| W | = | λ a | × | 2D |