Q 12-10-105JEE MainJEE Main 2021 (27 Jul, Shift 1)Easy
In Young's double slit experiment, if the source of light changes from orange to blue then:
Answer: (B) the distance between consecutive fringes will decrease.
Fringe width $\beta = \dfrac{\lambda D}{d}$. Blue light has a shorter wavelength than orange, so $\beta$ decreases.
The central fringe stays bright (zero path difference) and the minima remain dark.
Solution by Sreeraj P, M.Sc Physics