1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
OWS A K E O P A Q U E O B J E C T S M
S H A D
Answer:
OPAQUE OBJECTS MAKE SHADOWS
2. 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 aluminum, 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, the moon.
Answer:
opaque:
- a piece of rock,
- a sheet of aluminum,
- a mirror,
- a wooden board,
- a CD,
- a wall,
- an umbrella,
- a sheet of cardboard,
transparent:
- Air,
- water,
- a sheet of plane glass
translucent:
- a sheet of polythene,
- smoke,
- fog,
- a sheet of carbon paper,
- a sheet of cellophane,
- ware mess
luminous:
- a piece of red hot iron,
- a lighted fluorescent tube,
- the flame of a gas burner,
- a lighted torch,
- kerosene stove, firefly,
non-luminous:
- Other than the luminous object mentioned above is the non-luminous objects
3. 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?
Answer:
- The cylinder will give both circular and rectangular shadows.
4. 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?
Answer:
- No. Image forms in the mirror by the reflection of light.
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