6th Standard Science ( Light, Shadows and Reflections )

 

Light, Shadows and Reflections

I 1.Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Ans: OPAQUE OBJECTS MAKE SHADOW

 

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 aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, apiece 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.
Ans:

Opaque objects : a piece of rock, a sheet of aluminium, a mirror, wooden board, a CD, ah umbrella, a wall, a sheet of carbon paper, a sheet of cardboard.
 

Transparent objects : Air, water, a sheet of polythene, a sheet of plane glass, a sheet of cellophane, a wire mesh.
Luminous objects : a piece of red hot iron, a lighted fluorescent bulb, the flame of a gas burner, a lighted torch, kerosene torch, sun, firefly.

Non luminous objects : 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, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, moon.

 

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 ?
Ans: A cylindrical shape can give a circular shadow when light is incident from its top or bottom. It will give a rectangular shadow when light is incidental from its side.

 

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.
Ans:No, we will not be able to see Our reflection in the mirror because there is no source of light in the room.