1.

If the phase difference between the two light waves arriving at a point is (2n-1) `pi` radians. The condition for the minimumintensity of light at that point will beA. `I_("min") =(a_(1)-a_(2))^(2)`B. `I_("min") =a_(1)-a_(2)`C. `I_("min") =(a_(1)+a_(2))^(2)`D. `I_("min") =a_(1)^(2)-a_(2)^(2)`

Answer» Correct Answer - A
`I= R^(2)`
`=a_(1)^(2)+a_(2)^(2)+2a_(1)a_(2) cos (alpha_(1)-alpha_(2))`
`:. I_("min") =a_(1)^(2)a_(2)^(2)=-2a_(1)+a_(2)`
`=(a_(1)-a_(2))^(2)`


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