classify the given objects or materials as opaque , transparent or translucent and luminous and non-luminous :
air, water ,a piece of rock , a sheet of aluminium , a mirror, a wooden board , a sheet of polythene , a CD , a sheet of plane glass , a lighted fluorescent tube , a wall , 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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air is transparent
rock is opaque
mirror is opaque
a woodden board is opaque
a sheet of polythene is translucent
a CD is a non luminous object
a sheet of plane glass is transparent
a lightened flurosent tube is a luminous object
a wall is opaque
the fame of a gas is translucent
a sheet of cardboard is opaque
a lighted torch os a luminous object
sun is a luminous object
firefly is a luminous object
moon is a non luminous object
Hope these all would help you
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