light and lenses

                                 opaque: completely blocking light from passing through.

transparent:letting all light through,sothat objectson the other side can be seen clearly.

translucent:letting only some light through,so that objects on the other side appaer blurry.

polarization:allowing light vibrations to pass through in only one directions.

refration:the bending of light rays as they pass from one subtance 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 outward(is thiker at the edges than at the middle)and spreads  light rays apart.