transparent - allowing all the light to shine through, translucent - allowing some light to shine through, opaque - blocking all the light, shadow - it is formed when an object blocks light, retina - back part of the eye, night - moment when the Earth faces away from the sun, iris - colored part of the eye, pupil - small black hole in the eye through which light enters the eye, lens - part of the eye that focus light, photons - particles which make up light, cornea - membrane at the front of the eye, optic nerve - it takes the the impulses to the brain, refraction - the bending of light (when it changes direction), reflection - the bouncing of light off an object,

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