How do we see the object around us?
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Can we see any object in a completely dark room?
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What type of objects a chair, a painting and a shoe are?
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Is the light from a far away object able to travel to our eyes through opaque objects?
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What do we see on the ground, when a sunlight falls on the opaque objects?
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Do you observe your shadow in a dark room or at night when there is no light?
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Do you observe a shadow when there is just a source of light and nothing else in a room?
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Name the things other than source of light and opaque object required to see the shadow.
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Do the shadows look different in colour when the colours of the objects are different?
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Compare pinhole image with the shadow of some object.
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What is the condition for light in the formation of shadows and pinhole images?
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Through which pipe we can see the candle, straight pipe or curved pipe?
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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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Can you think of creating a shape that would give a circular shadow, if held in one way and a rectangular shadow, if held in another way?
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In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?
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