# Animals Grade 6 (Holt Science & Technology Modules 2005) by Holt Rinehart & Winston

By Holt Rinehart & Winston

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In our special example we have two spherical waves and we consider a point r, hit by these waves. Using the notation of fig. 12 ). 16) On the right-hand sides we have introduced new times t, by the relations t, = t — rdc, w = ck. 17) These times differ from the original time t by the time T, = r,/c, which is needed by the light waves to propagate from their original space points to the point under consideration. By this time lag the field amplitude suffers a phase shift. Again we obtain an interference pattern which is represented in fig.

In our special example we have two spherical waves and we consider a point r, hit by these waves. Using the notation of fig. 12 ). 16) On the right-hand sides we have introduced new times t, by the relations t, = t — rdc, w = ck. 17) These times differ from the original time t by the time T, = r,/c, which is needed by the light waves to propagate from their original space points to the point under consideration. By this time lag the field amplitude suffers a phase shift. Again we obtain an interference pattern which is represented in fig.

To this The intensity I then reads 1= 2A + 2B coscl) G(1,1) ± G(1,2) . 33) The phase factor (I) varies when the point r on the screen is changed. Let us consider I as a function of the phase factor O. In the case B = A we then obtain the shape shown in fig. 6, for B

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