Answer & explanation
Correct answer: option 3
$\text{ Let final intensity is equal to I}$
$ I = I_A cos^230^o = I_B cos^260^o$
$\Rightarrow \frac{I_A}{I_B} = \frac{1}{3}$
Correct answer: option 3
$\text{ Let final intensity is equal to I}$
$ I = I_A cos^230^o = I_B cos^260^o$
$\Rightarrow \frac{I_A}{I_B} = \frac{1}{3}$