Class 6 NCERT Solutions Science Chapter 11 - Light, Shadows and Reflections

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Light, Shadows and Reflections Exercise 113

Solution 1

Opaque objects make shadows.

Concept insight: An opaque object does not allow light to pass through it, so a shadow is formed.

Light, Shadows and Reflections Exercise 114

Solution 2

Object	Object is Transparent/Translucent/Opaque	Object is Luminous/Non-luminous
Air	Transparent	Non-luminous
Water	Transparent	Non-luminous
Piece of rock	Opaque	Non-luminous
Sheet of aluminium	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	Transparent	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 cellophane	Translucent	Non-luminous
Wire mesh	Translucent	Non-luminous
Kerosene stove	Opaque	Luminous
Sun	Opaque	Luminous
Firefly	Opaque	Luminous
Moon	Opaque	Non-luminous

Solution 3

When a cylinder is held in sunlight, then a circular shadow or a rectangular shadow can be obtained depending on its orientation related to the Sun.

Fig.

When the top of the cylinder faces the Sun, then the circular shadow is formed. On the other hand, when the side of the cylinder faces the Sun, then rectangular shadow is formed.

Solution 4

No, we will not be able to see our reflection in the mirror.

Concept insight: Image of an object is formed when light is reflected from the mirror. Since there is no source of light in the room, no image will be formed.