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Q2. 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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Here are classified objects as opaque, transparent, translucent, luminous and non-luminous.

Opaque	Transparent	Translucent	Luminous	Non-luminous
a piece of rock	Air	smoke	a piece of red hot iron	a piece of rock
a sheet of aluminium	Water	fog	a lighted fluorescent tube	smoke
a mirror	a sheet of plane glass	a sheet of cellophane	the flame of a gas burner	Air
a wooden board		a wire mesh	a lighted torch	a sheet of aluminium
a piece of red hot iron		a sheet of polythene	kerosene stove	water
an umbrella			sun	fog
a wall			firefly	a mirror
a sheet of carbon paper				a sheet of plane glass
a sheet of cardboard				a sheet of cellophane
moon				a wooden board
a CD				a sheet of polythene
				a wire mesh
				an umbrella
				a wall
				a sheet of carbon paper
				moon

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Gautam harsolia

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