Q:
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?
A:
In a completely dark room, there will be no light. The formation of an image depends upon the reflection of light. Therefore, no reflection of light takes place by the mirror placed in the dark room. Hence, no image will get formed by a mirror in a completely dark room.
Q:
Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
A:
It would be “Opaque objects make shadows”.
Q:
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?
A:
A cylinder kept in sunlight can form a circular shadow or a rectangular shadow. It can be obtained depending on its orientation related to the Sun. The cylinder forms a circular shadow when its top faces the Sun. When the side of the cylinder faces the Sun, then it forms rectangular shadow.
Q:
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.
A:
|
Object |
Transparent |
Luminous/Non-luminous |
|
Air |
Transparent |
Non-luminous |
|
Water |
Transparent |
Non-luminous |
|
Piece of rock |
Opaque |
Non-luminous |
|
Sheet of aluminum |
Opaque |
Non-luminous |
|
Mirror |
Opaque |
Non-luminous |
|
Wooden Board |
Opaque |
Non-luminous |
|
Sheet of polythene |
Translucent |
Non-luminous |
|
CD |
Translucent |
Non-luminous |
|
Smoke |
Translucent |
Non-luminous |
|
Sheet of plane glass |
Translucent |
Non-luminous |
|
Fog |
Translucent |
Non-luminous |
|
Piece of red hot iron |
Opaque |
Luminous |
|
Umbrella |
Opaque |
Non-luminous |
|
Lighted fluorescent tube |
Opaque |
Luminous |
|
Wall |
Opaque |
Non-luminous |
|
Sheet of carbon paper |
Opaque |
Non-luminous |
|
Flame of a gas burner |
Translucent |
Luminous |
|
Sheet of cardboard |
Opaque |
Non-luminous |
|
Lighted torch |
Opaque |
Luminous |
|
Sheet of cell phone |
Translucent |
Non-luminous |
|
Wire mess |
Translucent |
Non-luminous |
|
Kerosene stove |
Opaque |
Luminous |
|
Sun |
Opaque |
Luminous |
|
Firefly |
Opaque |
Luminous |
|
Moon |
Opaque |
Non-luminous |
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