| 摘要 |
In a four-stage type monochromator, there is provided a returning reflector 6 for making the dispersing direction of the wavelength of light 13e and 13h incident on and emergent from a plane diffraction grating 4 is reversed before and after its reflection. Angles of incident and emergent light at a time when the light is spectrally separated by the diffraction grating 4 are made identical.
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