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