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.
It would be “Opaque objects make shadows”.
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.
|
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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