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Individual viewing of the Balmer series of hydrogen.
The hydrogen spectral tube, used with its power supply as shown, is viewed individually by students holding small mounted pieces of holographic grating. The holographic grating produces a brighter but less dispersive spectrum than the standard replica grating, but is necessary because the hydrogen tube is not very bright. Please collect the holographic gratings; they are a bit more pricey than the hand-held replica gratings cut from a roll of material.
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