2. Classify the objects or materials given below as opaque. transparent orslucent and luminous or non-luminous:Air, water. a piece of rock, a sheet of aluminium, a mirror. asheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hotiron, an umbrella. a lighted fluorescent tube. a wall, a sheet of carbon papet,the flame of a gas burner., a sheet of cardboard, a lighted torch, a sheet ofcellophane, a wire mesh, kerosene stove sun fireily, moon.Can you think of creating a shape that would give a circular shadow if held inone way and a rectangular shadow if held in another way?In a completely dark room, if you hold up a mirror in front of you, will you see areflection of yourself in the mirror?4.

2. Classify the objects or materials given below as opaque. transparen

1.	2. Classify the objects or materials given below as opaque. transparent orslucent and luminous or non-luminous:Air, water. a piece of rock, a sheet of aluminium, a mirror. asheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hotiron, an umbrella. a lighted fluorescent tube. a wall, a sheet of carbon papet,the flame of a gas burner., a sheet of cardboard, a lighted torch, a sheet ofcellophane, a wire mesh, kerosene stove sun fireily, moon.Can you think of creating a shape that would give a circular shadow if held inone way and a rectangular shadow if held in another way?In a completely dark room, if you hold up a mirror in front of you, will you see areflection of yourself in the mirror?4.
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