Test_assessment knowledge optics #2 | LENS | FOCUS | FOCAL LENGHT | COLORS | ADDITIVE | LIGHT SPEED | LIGHT YEAR | EYE | MYOPIA | HYPEROPIA | Optics - Interactive Physics Simulations | Interactive Physics Animations | Interactive flash animation for optics learning. Physics and Chemistry by a Clear Learning in High School, Middle School, Upper School, Secondary School and Academy. PCCL