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At a point in an interference pattern, the two interfering coherent waves of equal intensity `I_(0)` have phase difference `60^(@)`. What will be the resultant intensity at that point?

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Resultant intensity, `I=2I_(0)(1+cos phi)`
`=2I_(0)(1+cos60^(@)) = 2I_(0)(1+1/2) = 3I_(0)`
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