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In the figure shown S,O-S,0=S,0-S,0 =: 4 $5. Intensity at O due to any one of the slits is Io. What is the intensity

In the figure shown S,O-S,0=S,0-S,0 =: 4 $5. Intensity at O due to any one of the slits is Io. What is the intensity due to all the three coherent sources S1, S2 and S3? S3 Io 9 Io (1) 3 I, (2) (3) 5 Io (4)

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