parallel line graticule
平行线分划板

• diffraction
• diffraction angle
• diffraction breakup
• diffraction broadening
• diffraction by aperture
• diffraction cone
• diffraction corons
• diffraction coupling
• diffraction curve
• diffraction disk
• diffraction efficiency
• diffraction fringle
• diffraction grating
• diffraction gratings
• diffraction halo
• diffraction image
• diffraction instrument
• diffraction integral
• diffraction limit
• diffraction-limited lens
• diffraction-limited lenses
• diffraction loss
• diffraction maximum
• diffraction modulation transfer function
• diffraction of electon