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