vocabulary 2

Opaque:completely blocking light from passing through.

Transparent:letting all light through,so that objects on the other side can be clearly.

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

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

refraction:the bending oh 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 inward ( is thicker at the edges than the middle) and spreads light rays apart.