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