Q. Classifythe objects or materials given below as opaque, transparent ortranslucent, luminous or non-luminous:
Air,water, piece of rock, sheet of aluminium, mirror, wooden board, sheetof polythene, CD, smoke, sheet of plane glass, fog, piece of red hotiron, umbrella, lighted florescent tube, wall, sheet of carbon paper,flame of a gas burner, sheet of cardboard, lighted torch, sheet ofcellophane, wire mesh, kerosene stove, sun, firefly, moon.