Youngs slits: Optical field showing constructive & destructive interference

 

 

Two slit in-phase sources

    red & blue - wave peaks from each source

            black - sum of two waves add to give near zero amplitude

                                                                   amplitude at x = 200

©  Peter Hammond  2004

 

            Wavefronts                        amplitude at x = 200                intensity at x = 200

©  Peter Hammond  2004