VOCABULARY 2 LIGHT AND LENSES.

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 BLURRY.
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.