Q. In a Young’s double slit experiment, the fringe width will remain same, if $(D =$ distance between screen and plane of slits, $d =$ separation between two slits and $\lambda =$ wavelength of light used)
A) Both $\lambda$ and $D$ are doubled
B) Both $d$ and $D$ are doubled
C) $D$ is doubled but $d$ is halved
D) $\lambda$ is doubled but $d$ is halved
Explanation
(b) $\beta = \frac{\lambda D}{d}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.