Placing the Diffraction Grating
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Take a piece of plastic diffraction grating. Handle the grating by the edges as much as possible. Temporarily tape the grating over the square hole. Point the box vertically so that the light from the fluorescent light enters the slit. Look into the box. You should see a visible spectrum to the right of the slit. If a thin horizontal rainbow is observed, rotate the grating 90 degrees. Carefully tape the grating around the edges to the box. The entire spectrum should fit inside the window. If is does not, enlarge the window.