Optics

Optics 20. Know how to fix near sightedness and far sightedness
 * 1) Incandescent
 * 2) Fluorescent
 * 3) Phosphorescent
 * 4) Chemiluscent
 * 5) Bioluminescent
 * 6) Primary Colours
 * 7) Secondary Colours
 * 8) Complementary colours.
 * 9) Rods and cones
 * 10) Law of reflection
 * 11) Concave convex
 * 12) Parts of the eye, iris, lens, retina,