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Two Lght beams of intensities I1 and I2 ...

Two Lght beams of intensities `I_1` and `I_2` produce an interference pattern. The contrast between the fringes is the best when :

A

`I_1=I_2/4`

B

`I_1=I_2/3`

C

`I_1=I_2/2`

D

`I_1=I_2`.

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