VOCABULARY:

Opaque: completly bloking light from passing through.

transparent: objects in the other side can be seeing clearly.

translucent: letting pass only the light.

polarization: allowing light to pass in only a direction.

refraction: the bending of light rays as they pass from one substance to another.

convex lens: a lens that curves outward and brings light rays together.

concave lens: a lens that curve inward and spreads light rays apart.