raypath
glow
radiance
glowing
beam steering
absorption spectrum
photo-
infrared spectrum
mediumwave infrared
photoinduced
absorbance
radiant
transmission density
angle of reflection
family Torpedinidae
optical density
Torpedinidae
photographic density
isocentre
light unit
light wave
fluorescence
tetraradial
cosmic infrared background
radiationally
electron beam
undulation
cosmic radiation
beam
ray
band
gamma ray
solar radiation
actino-
gamma radiation
eradiation
asteriated
upscattering
ultraviolet spectrum
octoradial
photoinitiated
transparency
background radiation
transparence
pencil
diffused
triradial
cosmo-
source of illumination
focus
radial
electropollution
cosmic ray
radioactivity
gyrotropy
radiately
ultraviolet radiation
opacity
penetrometer
photoelectroactivity
photoelectric effect
light spectrum
irradiated
radiatory
ground wave
emission spectrum
radiate
stellate
electronic reconnaissance
scintillation counter
gyratonic
homochromatic
radiology
monochromatic
caustic
radioscopy
scattering function
atomic spectrum
lightray
radiobiophysics
radiotropism
backscattering
BLRG
radiocautery
N-ray
diacaustic
electromagnetics
Tyndall effect
actinism
photoemission
electromagnetism