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