Question

In a young’s double slit experiment the resultant intensity at a point on the screen with two sources with intensities 2I and 8I is 14I. Calculate the phase difference between the two sources.

• A. ${40}^{\circ }$
• B. ${50}^{\circ }$
• C. ${60}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is C ${60}^{\circ }$

$I=I_1+I_2+2\sqrt{I_1{I}_2}cos\varphi$.
So ${60}^{\circ }$ is answer.