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Physics 19 Online
OpenStudy (anonymous):

With the laser, the diffracted images on the wall and the light source were on opposite sides of the grating. However, for the hydrogen and sodium lights, the light sources and the diffracted images were on the same side of the grating. Do you see any contradiction? Explain.

OpenStudy (vincent-lyon.fr):

There are two types of gratings: transmission and reflection ones.

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