Q. In an interference pattern produced by two identical slits, the intensity at the slit of the central maximum is $I$. The intensity at the same spot when either if the slits is closed is$I_{0}$. Therefore
A) $I = I_{0}$
B) $I = 2I_{0}$
C) $I = 4I_{0}$
D) $I\ and\ I_{0\ }$are not related to each other
Explanation
(c) When one slit is closed, amplitude becomes half and intensity becomes $1/4th$
$ie$,$I_{0} = \frac{1}{4}I\ \ or\ I = 4I_{0}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.