Polarization 2C12C1 Why Do We Need Two Eyes? Stereo Glasses Magic Eye Visual Illusions

2 Investigating Polarization Created for CVCA Physics by Dick Heckathorn 18 May 2K+3

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

4 Demonstration Waves Through A Board

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9 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?

10 Investigation Polarization g.Position pair of filters for minimum light Does any light get through? Place the third filter at 45 o between two.

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13 Do the polarize side windows provide privacy? Would you do this on your home?

14 Demonstration Sun glasses Cellophane

15 Demonstration Is reflected light polarized?

16 Next Time Question 27-3

17 3-D Viewing

18 IIC1 Why Two Eyes Page 26

19 1.Place a sharpened pencil in each hand and hold them apart at arm's length so that the sharpened ends face each other. IIC1 Why Two Eyes

20 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.

21 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.

22 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?

23 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.

24 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.

25 IIC1 Why Two Eyes Without moving the pencil, look at it with your right eye closed. If not, what is it lined up with now? Does the pencil still look lined up with the same object?

26 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?

27 IIC1 Why Two Eyes 6.Can you give a reason why two eyes help us to determine distance more easily than one eye?

28 IIC1 Stereo Glasses 8.Use the stereo viewers to look at the squares. Should you see three, concentrate on the one in the center.

29 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.

30 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?

31 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?

32 IIC1 Stereo Glasses 11.Can you explain these results in terms of the different view each eye has?

33 1.Read the article titled: “Can You See If? IIC1 Stereo Vision/Magic Eye

34 2.Look at black and white: “Magic Eye”. Can you see the 3-D image? IIC1 Stereo Vision/Magic Eye

35 3.Best Reference Stereogram ISBN: IIC1 Stereo Vision/Magic Eye

36 4.Newspaper Magic Eye IIC1 Stereo Vision/Magic Eye

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38 What Animal Is It? IID1 Visual Illusions

39 Rotating Window IID1 Visual Illusions

40 Dice IID1 Visual Illusions

41 PARIS IN THE THE SPRING

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44 Equipment ___ Polarization Box L-13 ___ Optical Illusion Box ___ Rotating Rotor Box L-5a ___ Handout 27-2 page (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 ___