absorption
abstract
art
beam
bright
brightness
color
colorful
design
diagram
diffraction
dispersion
drawing
education
educational
experiment
flat
glass
illustration
isolated
laboratory
lens
light
object
optic
optical
optics
physics
prism
pyramid
rainbow
ray
reflecting
reflection
refract
refracting
refraction
science
scientific
shine
spectral
spectrum
split
sun
triangle
triangular
visible
white
yellow
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