P
- paraxial approximation
- pattern recognition
- pentaprism
- penumbra
- periscope
- phase (waves)
- phosphorescence
- phot
- photodiode
- photoelectric effect
- photographic lens
- photography (science of)
- photometry
- photomultiplier
- photon
- photonic crystal
- photonics
- photon polarization
- photorefractive effect
- photoresistor
- physical optics
- pincushion distortion
- pinhole camera
- piston (optics)
- plasmonics
- pleochroism
- Pockels effect
- polarimeter
- polarization (waves)
- Polaroid (polarizer)
- population inversion
- Porro prism
- prime lens
- principal focus
- principle of least time
- prism (optics)
- prism compressor
- progressive lenses
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