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