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