Multiple slits diffraction

[asfd]

We had a lab on diffraction (Young's experience and more) and we are now asked what would be better to decompose a non-monochromatic light: a denser slitted sheet or a less dense one?

I really don't know how to solve this problem... it looks like I need more formulas than what I've currently got...

Any help is appreciated.

[Doc Al]

Monochromatic light will produce a single diffraction maxima for each order of diffraction. (One on each side, that is.) Non-monochromatic light will produce a spectrum of maxima for each order.

So which grating would better keep different order spectra from overlapping?

[asfd]

I guess a dense grating would be better since we would get narrower stripes for each color thus minimizing overlapping and color addition... Am I right?