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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 - ,
- A 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 -
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