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Stuck on Physics question about diffraction gratings watch

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    https://imgur.com/a/DU80t
    I know number of rulings is 1/d but I need sinx to find d and I don't know h9w distance from screen play into it
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    bump
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    It says to use a graphical method... find tan(theta) for each n, use that to find sin(theta) for each n, and tabulate the data.
    We know that d*sin(theta)=n*lambda so perhaps plot a graph to find a gradient which can be used to find 1/d.
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    that works thanks
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