clearance fit,snug fit
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- visible emissivity
- mode pattern
- filters
- geometrical focus
- multilongitudianl-mode laser
- astrospectrograph camera
- time-averaged shadow-moire method
- optical deformation
- diatomic roto
- frequency summing
- upper state relaxation
- optical harmonic generation
- Varotal lens
- optical head controllers,control ics/modules
- intensifying screen
- push out
- metacrystalline
- chronophotography
- infra-red beam folower
- holographic gratings