Question

plzz answer this question...without any spasm❌​

Answer 1

$\huge\underline{\underline{\bf \orange{Question-}}}$

If intensity of each wave in the observed interference pattern in Young's double slit experiment is ${\sf I_o}$ then for some point P where the phase difference is $\phi$ intensity I will be ⎯

$\huge\underline{\underline{\bf \orange{Solution-}}}$

We know that ⎯

✪${\boxed{\bf \blue{Resultant\: intensity (I)=I_1+I_2+2\sqrt{I_1I_2}cos\phi} }}$

$\implies{\sf I_1=I_2=I_o }$

$\implies{\sf I = I_o+I_o+2\sqrt{I_o^2}cos\phi}$

$\implies{\sf I = 2I_o+2I_o\:cos\phi}$

$\implies{\bf \red{I = 2I_o(1+cos\phi)}}$

$\huge\underline{\underline{\bf \orange{Answer-}}}$

Option (4) ${\bf \red{I = 2I_o(1+cos\phi)}}$.