Transparent: letting all light through,so that objects on the other side can be seen clearly.
Translucent: letting only some light throught, so that objects on the other side appear blurry.
Polarization: allowing light vibrations to pass through in only one direction.
Refraction: the bending of light rays as the 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) spreads light rays apart.
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