Investigating Polarization

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004 Polarization 2C1 Why Do We Need Two
Eyes? 027 Stereo Glasses 032 Magic Eye 036
Visual Illusions
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Investigating Polarization

• Created for CVCA Physics
• by
• Dick Heckathorn
• 18 May 2K3

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Investigation Polarization

• a. Look through a single polarizer.

b. Rotate the single polarizer.
Is there any intensity changes?
c. Look through two polarizers.
d. Slowly rotate filter near your eye
Is there any intensity changes?
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Demonstration

• Waves Through A Board

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Investigation Polarization

• e. Slowly rotate filter further from eye

Is there any intensity changes?
f. Place a third filter between the two.
Does any light get through?
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Investigation Polarization

• g. Position pair of filters for minimum light

Place the third filter at 45o between two.
Does any light get through?
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Do the polarize side windows provide privacy?
Would you do this on your home?
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Demonstration

• Sun glasses

Cellophane
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Demonstration

• Is reflected light polarized?

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Next Time Question 27-3
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3-D Viewing
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IIC1 Why Two Eyes

• Page 26

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IIC1 Why Two Eyes

• 1. Place a sharpened pencil in each hand and hold
  them apart at arm's length so that the sharpened
  ends face each other.

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IIC1 Why Two Eyes

• Now with both eyes open, bring the pencils
  slowly toward each other and try to touch the
  points together.

Describe what happens.
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IIC1 Why Two Eyes
2. Now try the same thing but do it with only one
eye open. Describe what happens.
Is this harder than Step 1? Explain your answer.
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IIC1 Why Two Eyes

• 3. Look around the room with both of your eyes
  open.

Look at some object in the room and then close
one eye.
How far does it move relative to the background?
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IIC1 Why Two Eyes

• Now close the other eye. How far does it move
  relative to the background?

Describe how it is different from the view with
two eyes.
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IIC1 Why Two Eyes

• 4. Hold a pencil at arm's length so that it is
  vertical.

With your left eye closed, look at the pencil
and line it up with some object across the room.
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IIC1 Why Two Eyes

• Without moving the pencil, look at it with your
  right eye closed.

Does the pencil still look lined up with the
same object?
If not, what is it lined up with now?
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IIC1 Why Two Eyes

• 5. Do Step 4, but this time have the pencil about
  6" from your face.

Did the pencil appear to shift its position more
or less than it did in Step 4?
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IIC1 Why Two Eyes

• 6. Can you give a reason why two eyes help us to
  determine distance more easily than one eye?

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IIC1 Stereo Glasses
8. Use the stereo viewers to look at the squares.
Should you see three, concentrate on the one in
the center.
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IIC1 Stereo Glasses
Do the square and circle both look the same
distance away or does one appear closer?
Should look the same distance away.
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IIC1 Stereo Glasses
Look at the squares through the viewer.
Does the circle seem to be at a different
distance than the square?
If so, is the circle closer / further away?
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IIC1 Stereo Glasses
10. Predict what you will see.
Does the circle seem to be at a different
distance than the square?
If so, is the circle closer / further away?
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IIC1 Stereo Glasses
11. Can you explain these results in terms of the
different view each eye has?
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IIC1 Stereo Vision/Magic Eye

• 1. Read the article titled
• Can You See If?

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IIC1 Stereo Vision/Magic Eye

• 2. Look at black and white
• Magic Eye.
• Can you see the 3-D image?

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IIC1 Stereo Vision/Magic Eye

• Best Reference
• Stereogram
• ISBN 0-929279-85-9

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IIC1 Stereo Vision/Magic Eye

• 4. Newspaper Magic Eye

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6 6 l 5 N 6 5

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IID1 Visual Illusions

• What Animal Is It?

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IID1 Visual Illusions

• Rotating Window

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IID1 Visual Illusions

• Dice

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PARIS IN THE THE SPRING
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Equipment

• ___ Polarization Box L-13
• ___ Optical Illusion Box
• ___ Rotating Rotor Box L-5a
• ___ Handout 27-2 page 9-100 (Honors only)
• 3 Waves through board
• 6 Three polarizers
• 14 Sun Glasses, cellophane
• ___ 18 Handout Why Do We Need Two Eyes
• ___ 28 Handout Using Stereo Viewers
• ___ 28 Stereo Viewers
• ___ 33 Handout Can You See It?
• ___ 35 Books with orange tag on bottom
• ___ 36 Handout Newspaper Magic Eye (B and W)
• ___ 38 Animal
• ___ 39 Rotating Window
• ___ 40 Dice
• ___