In YDSE, the intensity of the central maximum is I. What will be the intensity at the same point when one slit is closed ?
Answer & explanation
Correct answer: option 3
Intensity $I = (\sqrt I_1 + \sqrt I_2)^2 = (\sqrt I_1 + \sqrt I_1)^2 = 4I_1$
When one slit is closed , the intensity will be $I_1 = \frac{I}{4}$