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Friday, January 8, 2010

Chapter 17 - Light
Light is a form of energy. Light travels in straight lines. Light in a vacuum travels 300,000,000 m/s.
Rays and Beams
Light rays is the path of light from a source. A bundle of light rays is known as a beam of light. Beams of light can be parallel, divergent or convergent.
REFLECTION
Regular Reflection
- when light rays hit smooth surface
- clear and undistorted image can be seen
- parallel beam of light remains parallel after regular reflection.
Irregular/Diffuse Reflection
- when light rays hit rough surface
-no reflected image seen
- parallel beam of light hits rough surface, gets scattered or reflected in an irregular manner.

Periscopes

- made of two plane mirrors to see over obstacles

I AM GRUMPY.
3:45 AM


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      Name: Abigail (:
      School: PLMGSS
      Class: 1-2b '09 , 2-2 '10

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