Q. The slits in a Young’s double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is $I_{0}$. If one of the slits is closed, the intensity at this point will be
A) $I_{0}$
B) $I_{0}/4$
C) $I_{0}/2$
D) $4I_{0}$
Explanation
(b) If intensity of each wave is $I$, then initially at central position $I_{o} = 4I$. When one of the slits is covered then
Intensity at central position will be $I$ only, $i.e.,\frac{I_{o}}{4}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.