Light and lenses

                                                                               Vocabulary#2
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 blurrry.

polarization: allowing light vibrations to pass through 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.