young's slit experiment and diffraction question

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i can't do b part 1 since i'm too inept ;( although i should know how to do it....

a part 2 though
$\omega = \dfrac {\lambda D}{s}$

so if you increase s for example $\lambda$ would get smaller and the fringe spacing would get smaller? so the pattern on the graph would have a lower frequency? so slit width is bigger than wavelength of light? i'm really not sure but it's somewhere to start i guess

then you got part 3
$\omega = \dfrac {\lambda D}{s}$
so increase s decrease w right?

Thanks for the reply but what does w and s stand for cause I don't learn the formula using those letters