Q. The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio, $\frac{I_{max} - I_{min}}{I_{max} + I_{min}}$ will be
A) $\frac{\sqrt{n}}{n + 1}$
B) $\frac{2\sqrt{n}}{n + 1}$
C) $\frac{\sqrt{n}}{(n + 1)^2}$
D) $\frac{2\sqrt{n}}{(n + 1)^2}$
Explanation
[Solution] With amplitudes in ratio $\sqrt{n} : 1$: $\frac{I_{max} - I_{min}}{I_{max} + I_{min}} = \frac{4\sqrt{n}}{2(n + 1)} = \frac{2\sqrt{n}}{n + 1}$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.