opaque=completely blocking light from passing through.
Transparent=letting all light through ,so that objects on the other side can be seen clearly .
translucent= letting only some light through, so that objects on the other side appear blurry .
polarization = allowing light vibrations to pass throught in only one direction .
refraction =the bending of light rays as they pass from one substance into another.
convex lens = a lens that curves outward (is thicker at the middle than at the edges ) and brings light rays together .
concave lens= a lens that curves inward (is thicker at the edges than at the middle ) and spreads light rays apart.
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