the bouncing of light waves off a surface
reflection
the bending of light as it passes from one tansparent material into another
refraction
a lens that is thinner in the middle that always makes objects look smaller
concave lens
a lens that is thicker in the middle that always makes objects look larger
convex lens
letting all the light through, so objects on the other side can be seen clearly
transparent
letting only some light through, so objects on the other side appear blurry
translucent
completely blocking light from passing through
opaque
