HOW DOESPOLARIZEDLIGHT BEHAVE AND WHAT IS3-D?

Filtering Out the Waves

WHAT IS POLARIZED LIGHT?• Light travels in waves• Light waves are transverse• Sound waves are longitudinal

Transverse

Longitudinal

How do light waves move?• Light is non-polarized and vibrates in all

directions• It has horizontal and vertical

movements

How Does Polarization Happen?• When a plane of light is selected or

filtered out, it becomes polarized• Glare from the water or road is partially

polarized from the reflection of light

Using Polarized Sunglasses• Polarizing filters select a vertical plane

of light movement

Polarizers Can Block Out Light

• Two polarizing filters, rotated 90° opposite of each other can completely block light

ANAGLYPHONLINE ACTIVITY

Your Turn…

How Does 3-D Viewing Work• Our eyes are set about 2.5 inches apart• Each eye takes a slightly different view

of the same object

3-D Viewing Continued

• The brain combines the similarities of the object

• It also adds up the differences that each eye observes

• The 2-eye viewing combines to form a 3-D stereo image

How Does 3-D Stereograms or Anaglyph Work?

• 3-D Stereograms require the person to focus past the page or computer screen

• Put your nose close to the page or computer screen and slowly move away till you can view the 3-D object

Anaglyphs Continued• Requires glasses with a

red left lens and a cyan right lens

• The left eye only views an image that selects the red from the photo

• The right eye only views an image that selects the cyan from the photo

Anaglyphs Continued

• The images on the photo are slightly offset• Your brain takes the red and cyan images with

slightly different views and combine to form a binocular stereopsis

Anaglyph Continued

How Do 3-D TV and Movies Work?

• A 3-D slide show or movie has one horizontally polarized view and another vertically polarized view.

• The viewer wears polarizing eyeglasses with the lens axes also at right angles.

How Do 3-D TV and Movies Work?

Homework

• Review Chapter 27 and 28• Answer Ques. 20, 22, 23, 46, 64