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julie sippola

on 1 December 2014

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Transcript of Light

Light-a form of energy that travels in straight lines in all directions.
Light can behave in one of 3 ways when it encounters an object.
Objects can be transparent, translucent or opaque. Get ready to write a definition for each based on what you are about to see.
Based on what you see in the following picture write a definition for reflection.
Reflection-light bouncing off an object to our eyes
Based on what you just saw and the picture you are about to see, write a definition for refraction.
Refraction-light is bent when it passes from one substance to another.
This is why the sky is blue. All the colors are absorbed but blue is the color reflected back to our eyes.
Rainbows are an example of reflection and refraction.
Vocabulary words:
The speed of light is about 186,000 miles per second. To put that in perspective, when you watch the sun set, it has actually been 10 minutes since that light left the Sun.
Which is transparent?
Which one is opaque?
Light can also be absorbed. Objects absorb some colors and reflect others.
Light can travel through a vacuum. (not the kind your Mom uses to sweep a floor, but a place where there are no molecules). Where would you find such a place?
Optical Illusions
Bill Nye-Bending and Bouncing Light
Bill Nye-Penn and Teller
Full transcript