Refraction

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Refraction
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How do you make light bend?

• When light rays enter a new medium they change in
  speed, causing them to bend or change direction.

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What is refraction?

• The bending of light as it enters a new medium
• Examples
• Air to water
• Water to air
• Water to glass
• What is a medium?
• A material through which a wave (light) travels

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Refraction can cause you..

• To see something that may not actually be there.
• That is called an Image.

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Refraction Animation
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Figure 8

• Read the first paragraph on page 188 out loud.

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What is the index of refraction?

• How much a ray of light bends when it enters a
  new medium.

Liquids Carbonated Beverages 1.34 -
1.356 Cranberry Juice (25) 1.351 Honey
1.484 Ice 1.309 Oil, vegetable (50 C)
1.47 Shampoo 1.362 Water (0 C) 1.33346 Water
(100 C) 1.31766 Water (20 C) 1.33283
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Online Example

• http//www.snoweria.com/flash/angle_of_refraction.
  html

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What is white light?

• All the colors on the visible spectrum

R
O
Y
G
B
I
V
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Can it be separated?

• You Bet!!!
• Use a prism to separate light into its various
  wavelengths.

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THINK How does a rainbow occur?

• White light from the sun enters a rain drop
• The rain drop acts as a prism causing the white
  light to separate.
• Displaying the visible spectrum.