The physical property of a medium as determined by its index of refraction.
synonym: refractiveness.
Roget 420:
light,
ray,
beam,
stream,
gleam,
streak,
pencil;
sunbeam,
moonbeam;
aurora.
day;
sunshine;
light of day,
light of heaven;
moonlight,
starlight,
sunlight
etc.
(luminary)
432;
daylight,
broad daylight,
noontide light;
noontide,
noonday,
noonday sun.
glow
etc.
v.;
glimmering
etc.
v.;
glint;
play of light,
flood of light;
phosphorescence,
lambent flame.
flush,
halo,
glory,
nimbus,
aureola.
spark,
scintilla;
facula;
sparkling
etc.
v.;
emication†,
scintillation,
flash,
blaze,
coruscation,
fulguration†;
flame
etc.
(fire)
382;
lightning,
levin†,
ignis fatuus [Lat.],
etc.
(luminary)
423.
luster,
sheen,
shimmer,
reflexion [Brit.],
reflection;
gloss,
tinsel,
spangle,
brightness,
brilliancy,
splendor;
effulgence,
refulgence;
fulgor†,
fulgidity†;
dazzlement†,
resplendence,
transplendency†;
luminousness
etc.
adj.;
luminosity;
lucidity;
renitency†,
nitency†;
radiance,
radiation;
irradiation,
illumination.
actinic rays,
actinism;
Roentgen-ray,
Xray;
photography,
heliography;
photometer
etc.
445.
[Science of light]
optics;
photology†,
photometry;
dioptrics†,
catoptrics†.
[Distribution of light]
chiaroscuro,
clairobscur†,
clear obscure,
breadth,
light and shade,
black and white,
tonality.
reflection,
refraction,
dispersion;
refractivity.
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