Question: For your science fair project you need to design a diffraction grating that will disperse the visible spectrum (400700 nm) over 30.0 in first order.

For your science fair project you need to design a diffraction grating that will disperse the visible spectrum (400–700 nm) over 30.0° in first order.
a. How many lines per millimeter does your grating need?
b. What is the first-order diffraction angle of light from a sodium lamp (λ = 589 nm)?

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