1.

lassify the objects or materials given below as opaque, transparentranslucent and luminous or non-luminous:water, a piece of rock, a sheet of aluminium, a mirror, a wooden board.aheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hoton an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paperir,

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