convex-plane cylindrical lens
平凸柱形透镜

• Luneburg's integral
• lunik
• luninescence stimulation
• lusec
• lustre
• lustrous
• lustrous eye
• lutecium
• lux
• Lux
• lux-hour
• Luxmeter
• lux-second
• lyear
• Lyman-alpha radiation
• Lyman band
• Lyman continuum
• Lyman ghost
• Lyman series
• lyo-luminescence
• Lyot coronograph
• Lyot depolarizer
• Lyot filter
• Lyot-Ohman filter
• Lyot's filter