rayleigh
(R)瑞利(光强度单位，等於106量子∕厘米2)

• projection microscope
• projection objective
• projection optics
• projection optimeter
• projection perimeter
• projection photometry
• projection surface
• projection tripod
• projective geometry
• projective layer
• projective transformation
• projectivity
• project meter
• projector
• prolate ellipsoid
• prolate function
• prolate spheroidal wae functon
• proliferation
• prolonged lenticular
• promethium
• prominence
• prompt
• prompt critical
• prong
• proof