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
Refraction
How do you make light bend?
 When light rays enter a new medium they change
in speed, causing them to bend or change direction.
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
Refraction can cause you…..
 To see something that may not actually be there.
 That is called an Image.
Refraction Animation
Figure 8…
 Read the first paragraph on page 188 out loud.
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
Online Example
 http://www.snoweria.com/flash/angle_of_refraction.h
What is white light?
 All the colors on the visible spectrum
R
O
Y
G
B I
V
Can it be separated?
 You Bet!!!
 Use a prism to separate light into it’s various
wavelengths.
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.

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Refraction

  • 2. How do you make light bend?  When light rays enter a new medium they change in speed, causing them to bend or change direction.
  • 3. 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
  • 4. Refraction can cause you…..  To see something that may not actually be there.  That is called an Image.
  • 6. Figure 8…  Read the first paragraph on page 188 out loud.
  • 7. 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
  • 9. What is white light?  All the colors on the visible spectrum R O Y G B I V
  • 10. Can it be separated?  You Bet!!!  Use a prism to separate light into it’s various wavelengths.
  • 11. 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.