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A diffraction grating with spacing d = 2000 nm produces an interference pattern on a screen...

A diffraction grating with spacing d = 2000 nm produces an interference pattern on a screen at a distance of 32 cm. If the first and second maxima produced are located at y = 3 cm, and 5 cm respectively, what is the wavelength of the light? Is this light visible? What does that say about the screen in this apparatus? If the frequency of the light used in question 1 above is decreased, will the positions of the maxima relative to the central axis increase or decrease?
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