class 6 ch 11

Light, Shadows And Reflections : NCERT Class VI Science Lesson 11

NCERT Class VI Science textbook:
Lesson 11: Light, Shadows And Reflections.

Exercise

1.Question.

Answer.


2. Question. Classify the objects or materials given below a opaque, tranparent or translucent and luminous or non_ luminous:
Air,water, A piece of rock, A sheet of aluminum, 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, A flame of a gas burner, A sheet of cardboard, A lighted torch, A sheet of cello- phane, A wire mesh, Kerosene stove, sun Firefly, Moon.   

Answer.

Luminous                        Non- luminous.
A piece of red hot iron          Air.
A lighted fluorescent tube.      Rock
flame of a gass burner.          Aluminum.
lighted torch.                   Wooden board.
Kerosene stove                   CD.
sun Firefly                      Wire mesh. 
                                 Mirror.
                                 Polythene.                               
                                 Moon.           
                                 Fog.
                                 Smoke.
                                 Cardboard.
                                 Cello- phane.
                                 wall.
                                 Plane glass.
                                 Water.
                                 Cardboard

3. Question. Can you think of creating a shape that would given a circular Shadow if held in one way and a rectangular shadow
if held in another way?Answer. Yes.

4. Question. In a completely  dark room, if you hold  up a mirror in front of you, will you see reflection of yourself in the mirror?Answer. In a completely  dark room, on cannot see any image in the mirror, because there is no light falling on mirror Which can be reflected to show the image.