Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 71
ll reach P in thesame phase, and will therefore reinforce one another andform a bright band. If Q is chosen, so that AQ is justhalf a wave-length longer than BQ, then the waveletsemerging from A and B will reach Q in opposite phases,and therefore we shall get darkness. As we move outfrom P to Q the… … Fig. 39. Q. This gradual shading off is characteristic of all thebands produced by interference or diffraction which wehave considered up to the present. Now suppose wehave four slits equally spaced instead of two. We shallget agreement of phase at P for all four slits and opposi-tion of phase at Q…
Light
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