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Two coherent sources of intensity ratio ...

Two coherent sources of intensity ratio `beta` interfere, then `(I_(max)-I_(min))/(I_(max)+I_(min))` is

A

`(beta)/(1 + beta)`

B

`(2 sqrt(beta))/(1 + beta)`

C

`(2 sqrt(beta))/(1 + sqrt(beta))`

D

`(2 beta )/( 1 + sqrt(beta))`

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