Understanding Light

Created by:
Barbara Orosz 
Irvine Unified School District

This Page - URL
http://www.can-do.com/uci/ssi2003/light.html

Grade level: 7th grade
California Science Content Standards:  See teacher page
 



 

UCI Science WebQuests from all years
 



Purpose: 
The purpose of this lesson is to give you a better understanding of what happens to light when it hits different materials.  You will be involved in interactive web activities as well as hands-on experiments to help reinforce the concepts of reflection, absorption, transmission, scattering and refraction of light.


 
Your Task: 
You will need to complete at least 5 of the Light Activities listed below and record your results in your Lab Notebook. (Click on the highlighted words for directions.)
 
 
 

ACTIVITY 1:  REFLECTION OF LIGHT
Reflection occurs when light or any other wave bounces off an object. REFLECTION enables you to see objects that don't produce their own light.

ACTIVITY 2:  SCATTERING OF LIGHT
Scattering is the release of light energy by particles that have absorbed extra energy. Light from a flashlight is SCATTERED out of the beam by air particles. Translucent materials scatter light as it passes through.

ACTIVITY 3:  ABSORPTION OF LIGHT
Absorption is the transfer of energy carried by light waves to particles in matter. You cannot see through OPAQUE objects because light cannot pass through them. Opaque materials reflect and/ or absorb all light waves.

ACTIVITY 4:  TRANSMISSION OF LIGHT
Transmission of light is the passing of light through matter. The light that reaches your eyes is transmitted through air. TRANSPARENT materials allow light to pass through.

ACTIVITY 5:  REFRACTION OF LIGHT
The bending of light due to a change in its speed is called REFRACTION. When light passes from air (less dense) to water (more dense) it slows down. Passing white light through a PRISM separates or refracts the light into different colors.

ACTIVITY 6:  Primary Colors- Additive and Subtractive  - from the Ontario, Science Centre, in Toronto, Ontario, Canada
Primary Colors:  
Additive colors -
are red, blue and green. - for color projection.
Computer displays, TV sets have these three pixel colours - (AKA Pixel elements)  
Try mixing these colors (colours)  Try mixing additive colours! - requires shockwave plugin from macromedia.com

Subtractive colors -  are  yellow, cyan - (light blue) and magenta (light purple)  
Artists paint with subtractive colors. - for painting.
Try mixing these colors (colours)  Try mixing subractive colours! - requires shockwave plugin from macromedia.com

ENRICHMENT ACTIVITIES: 
Create a WORDSEARCH or CROSSWORD PUZZLE to test your understanding of the new terms you learned.
Create a Power Point Presentation on light.  (No more than 5 slides)
 
 

  After you have written your results in your lab notebook, take the short Quiz about Light.  
How did you do?

 


Congratulations! Now you are ready for Click here to take the quiz
 
 



 
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E-Mail:  borosz@iusd.org
 

Created
August 22, 2003

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