Chapter - 11
Light, Shadows and Reflection
NCERT MP Board Class 6 Science Chapter 11 Light, Shadows and Reflections
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NCERT MP Board Class 6 Science Chapter 11 Light, Shadows and Reflections
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NCERT MP Board Class 6 Science Chapter 11 Light, Shadows and Reflections
Solutions
Q.1.Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
Ans. OPAQUE OBJECTS MAKE SHADOWS.
Q.2 Classify the objects or material 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.
Ans. Opaque objects: A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a wall, a sheet of cardboard .
Transparent objects: Air, water, sheet of plan glass
Translucent objects: A sheet of polythene, smoke, fog, a sheet of carbon paper, a sheet of cellophane.
Luminous objects: A piece of red hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, firefly, kerosene stove .
Non luminous objects: An umbrella, a wire mesh , moon .
Q.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. Yes, we can 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.
Circular Shadow
Rectangular Shadow
Q.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, in a completely dark room, we cannot see our right - left inverted image in the mirror, because there is no source of light.
Activity 1. Look around you and collect as many objects as you can — an eraser , plastic scale , pen , pencil, notebook, single sheet of paper, tracing paper or a piece of cloth . Try to look at something far away , through each of these objects. Is light from a far away object able to travel to your eye , through any of the Record your observation in a table.
Activity 2. Describe an experiment which shows that light propagates in a straight line.
Ans .
Take a comb and fix it on one side of a thermacol sheet. Fix a mirror on the other side as shown in figure. Spread a dark coloured sheet of paper between the mirror and the comb. Send a beam of light from a torch through the comb. You get a pattern of light similar to that shown in figure. This activity explains the manner in which light travels and gets reflected from a mirror.
Fig. Light travelling in a straight line and getting reflected from a mirror