transparent:letting all light through so that object on the side appear
translucent:letting all light through so that object on the side appear blury
polarization:allowing light vibrationto pass through in only dirrection
refraction the bending of light ray as they pass from one subtance into another
convex lens a lens that are curve outward and bring light toguether
concave a lensthat curve inward at the edge and spread light ray apart
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