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Question-1. What is plane transmission diffraction grating?
Answer-1: A plane transmission diffraction grating is an optically plane parallel glass plate on which equidistant, extremely close grooves are made by ruling with a diamond point.
Question-2. In our experiment. What class of diffraction does occur and how?
Answer-2: Fraunhofer class of diffraction occurs. Since the spectrometer is focused for parallel rays, the source and the image are effectively at infinite distances from the grating.
Question-3. How are the commercial gratings are made?
Answer-3: A commercial gratings is made by pouring properly diluted cellulose acetate on the actual grating and drying it to a thin strong film. The film is detached from the original grating and is mounted between two glass plates. A commercial grating is called replica grating. In our experiment we use plane type replica grating.
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