transparent: letting all light through, so that object 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 vibrationsto pass through in only one directon.
refraction: the bending of light rays as they pass from one substance to another
convex lens:a lens that curves outward (is thicker at the middle than at the edges) and brings light rays togethe
concave lens:a lens that curves inward (is thicker at the edges than at the mirror) and spreads light rays part.
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