Question

In YDSE, intensity at two sources are in ratio of $1: 9$. if source are incoherent then intensity at central point is $I_1$, and if sources are coherent (and phase differs by $60°$) then intensity at central point is $12$ then $\frac{I_1}{I_2}$ is

• A. $\frac{10}{13}$
• B. $\frac{5}{13}$
• C. $\frac{8}{13}$
• D. $\frac{7}{11}$

Answer 1

Answer: (A)

$\frac{10}{13}$

Answer 2

The Correct Option is (A) :$\frac{10}{13}$