NCERT Solutions for Class 6 Science Chapter 11 Light Shadow and Reflection
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Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
OPAQUE OBJECTS MAKE SHADOWS
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. Answer:
First let us explain the each term
If we are able to see clearly through an object, it is said to be transparent
If we are able to see not clearly through an object, it is said to be translucent
If we cannot see through an object at all, it is an opaque object
A body which emits light by itself
A body which does not emits light by itself
Let us create a table to show the properties
Piece of Rock,
Sheet of Aluminium,
Mirror, Wooden Board,
CD, Umbrella, Wall,
Sheet of Carbon Paper,
Sheet of cardboard,
A sheet of polythene,
Sheet of cellphone,
A piece of Red hot iron,
Light fluorescent tube,
Flame of gas burner
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
A cylinder object can cast shadows in two ways. When the top circular view faces the sun, a circular shape shadow is formed. When its horizontal side faces the sun, it casts a rectangular shadow.
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
To see the reflection, source of light is required We can only see in the presence of light.