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the rectilinear propagation of light

measurement of angles in radians

obscure rays in a spectrum

plane-polarized light

slanting rays of light

polarize light waves

linearly polarized radiation

a measure of luminous intensity

polarized light

a penetrating light ray

an imaginary line in a field of force

a ray of reflected light

to measure the intensity of light

a measure of luminance

concentrate rays of light

scintillation of laser beams

a measure of illumination

reflecting light

a bright spot on the parhelic circle

reflected light

in physics in anisotropic crystallization, an optical axis

refraction of light

a spatially localized brightness

the intensity of a light

an optical spectrum consisting of narrowly spaced lines, called band spectrum

the spectrum of visible rays of light

reflection of light

the intensity of light

refracted light

the luminous flux incident on a unit area