CBSE Class 6 Science Chapter 11 : Light, Shadows and Reflections Additional Questions

CBSE Class 6 Science 

Chapter 11 :  Light, Shadows and Reflections

 Additional Questions

1.  What are luminous objects? Give two examples
2.  What are opaque, transparent and  translucent objects? Give one example each
3.  How does the shadow formed? 
4.  How can we make a simple pin hole camera?
5.  Give an example of a pin hole camera, which we see in nature
6.  Give an experiment which shows that light travels in a straight line
7. What is mean by rectilinear property of light?

 Answers

1.  Objects that give out or emit light of their own are called luminous objects. Examples of luminous objects are sun, torch.
2. The Objects which does not allow light to pass through it are called opaque objects. Wood is an example for an opaque object . The objects which allow light to pass through it are called transparent objects. Example for a transparent object is glass. The objects which partially allows light to pass through it are called translucent objects. Ice is an example for a translucent object.
3. Light travels in a straight line. Shadow is formed, when a opaque or translucent object is kept in the path of a light source.
4. Take two boxes so that one can slide into another with no gap in between them. Cut open one side of each box. On the opposite face of the larger box, make a small hole in the middle.In the smaller box, cut out from the middle a square with a side of about 5 to 6 cm. Cover this open square in the box with tracing paper (translucent screen). Slide the smaller box inside the larger one with the hole, in such a way that the side with the tracing paper is inside. This is how we can a make a pin hole camera at home.
5. The small patches of sun light the tree covered with large number of leaves are the pin hole images of the sun. In this case,the gaps between the leaves, act as the pin holes.
6. Take a rubber tube. Light a candle and fix it on a table. Now look the lighted candle through the pipe by holding it straight. The candle is visible now. Slightly bend the rubber tube and look at the same candle. The candle is not visible. This activity shows that light travels in a straight line.
7. Light travels in a straight line. This is called the rectilinear property of light.