Transparent: letting all light through, so that objects on the othre side can be seen clearly.
Translucent: letting only some light through, so that objects on the other side appear blurry.
Polarization: allowing light vibration to pass trough 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 brigs 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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