The phase difference between the two light waves arriving point is `2n pi `radians. The condition for maximum intensity of light at that point is

Options

A. `I_("max")=a_(1)+a_(2)`
B. `I_("max")=(a_(1)+a_(2))^(2)`
C. `I_("max")=(a_(1))/(a_(2))`
D. `I_("max")=(a_(1)+a_(2))/(a_(1)-a_(2))`

Answer

B

Explanation

`I= R^(2)`
`=a_(1)^(2)+a_(2)^(2)+2a_(1)a_(2) cos (alpha_(1)-alpha_(2))`
`:. I_("max") =a_(1)^(2)+a_(2)^(2)+2a_(1)a_(2)`
`=(a_(1)+a_(2))^(2)`