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