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

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