If the source of light used in a Young's double slit experiment is...

$\beta = \dfrac{\lambda \cdot D}{d}$

${\lambda}_{R} > {\lambda}_{V}$

${\beta}_{R} = \dfrac{{\lambda}_{R}D}{d}$ and ${\beta}_{V} = \dfrac{{\lambda}_{V}D}{d}$

${\beta}_{R} > {\beta}_{V}$

Fringe pattern will shrink.