Classify the objects or materials given below as opaque,transparent or translucent and luminous or non-luminous.
Air, water, a piece of rock, a sheet of aluminium, a mirror , a wooden board, a sheet of polythene,a CD ,smoke , a sheet of plane glass, fog, a piece of red hot iron, an umbrella, lighted fluorescent tube , a wall ,a sheet of carbon paper , the flame of a gas burner, a sheet of cardboard, a lighted torch , a sheet of cellophane, a wire mesh, kerosene stove ,sun, firefly, moon.