Instructables

Step 7: Diffuser

For very point-like light sources, such as the sun, you will find it difficult to form a good, wide, spectrum. In these cases cut a small square of material from a thin translucent bag and fix it over the front of the slit. This will spread the light so you can see the entire slit imaged as a spectrum.
 
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myrddyn5 years ago
A good source for a diffuser is the window from the next bill you get in the mail. You typically don't have to worry about wrinkles, and it's a nice even diffusing material.