Q. If the sodium light in Young’s double slit experiment is replaced by red light, the fringe width will
A) Decrease
B) Increase
C) Remain unaffected
D) First increase, then decrease
Explanation
(b) $B \propto \lambda$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.