White coherent light (400 nm-700 nm) is sent through the slits of a Young's double slit experiment.

White coherent light ( $400 \mathrm{~nm}-700 \mathrm{~nm}$ ) is sent through the slits of a Young's double slit experiment. The separation between the slits is $0.5 \mathrm{~mm}$ and the screen is $50 \mathrm{~cm}$ away from the slits. There is a hole in the screen at a point $1.0 \mathrm{~mm}$ away (along the width of the fringes) from the central line. (a) Which wavelength(s) will be absent in the light coming from the hole? (b) Which wavelength(s) will have a strong intensity?