horizontal lens angle
透镜浅平角，物像场水平角

• gamma-ray meter
• gamma-ray projector
• gamma-ray spectrograph
• gamma-ray spectromete
• gamma-space
• gamma sphere
• gamma value
• gamut
• GaN
• Ganecke projection
• gang capacitor
• gang switch
• GaN LED
• GaP
• gap coding
• gap conunter
• gap-gauge
• gap length
• gap loss
• Garching iodine laser system
• garment
• garmnet
• garnet crystal
• garnet laser
• gas