Discussion Forum

Young's double-slit experiment is carried out by using green,  red and blue light, one colour at a time. The fringe widths  recorded are $\beta_{G},\beta_{R}$ and $\beta_{B}$ respectively, then 

Answer:

Explanation:

Fringe  width $\beta= \frac{\lambda D}{d}$

or   $\beta \propto \lambda$

Now, $\lambda_{R} > \lambda_{G}  > \lambda_{B}$

$\therefore$   $\beta_{R}$ > $\beta_{G}$>  $\beta_{B}$