2012年10月29日星期一

LEARNING ACTIVITIES …



Light travel in a straight line





Form of shadow





Experiment ... 







We can learn more from experiment …
Happy to learn … yes !!!

2012年10月23日星期二

Science Notes II


7. When the distance between an object and its light source decreases, the size of the shadow increases.
8. When the distance between an object and the light increases, the size of the shadow decreases. 


 9. The shape of shadows changes according to the 
     position of the light source.


10. Light can be reflected.
i.             When light dwells on objects, the objects will reflect lights to our eyes and as a result we can see the objects.
ii.           Ray Diagram of reflection of light.

iii.         Examples of uses of reflection of light in everyday life.
·       Mirror

·       Periscope

·       Kaleidoscope

2012年10月17日星期三

Science Notes I

1.  Light helps us to see things.
2. Sun is the main source of light.
3. Light travels in a straight line.
    Example:
Can see the light


Cannot see the light

4. The formation of shadow is due to the disability of an object to let all light pass through it.
5.  Object that do not let all light pass through are called opaque object.  Example:  pencil, basketball.

  


6.  Object that allow a part of light to pass through are called translucent objects.  Example:  translucent glass.



2012年10月13日星期六

LIGHT


Do you know?



Light travels at a speed of 299,792 kilometers per second. 
It takes 499.0 seconds for light to travel from the Sun to the earth.