Untitled presentationd&d

By: Desmond Mitchell and DaVon Curvin

13.4 Color and Polarization

Objectives:

❖Recognize how additive colors affect the

color of light.

❖Recognize how pigments affect the color

of reflected light.

❖Explain how linearly polarized light is

formed and detected.

Color appears when light reflects off an

object

❖For example

➢Green leaves appear green because

they show all wavelengths of light

except green

Color

Introduction to Color

❖The color of an object appears different

depending on the lighting conditions.

➢Like under a blacklight.

❖ The color of an object depends on

➢ wavelengths of light shine on the object

➢which wavelengths are reflected.

Color

❖ A surface that reflects all colors without absorbing any

of its colors shows white.

❖ A surface that absorbs all colors, reflecting none shows

black.

All colors are caused by light and the way light affects

the eyes.

Color

❖White light is a combination of

red, orange, yellow, green, blue and

violet.

❖When light hits an object

wavelengths are absorbed,and reflected.

Color and Light❖ A prism breaks up light

into six colors.

❖ The beams of light can’t be

broken up, but can be put

back together

❖ If you add two colors of pure light

together it creates two different colors

Color and Light

Color and Lighthttp://www.absorblearning.com/media/attachment.action?quick=90&att=640

Polarization❖ The process of transforming unpolarized light into

polarized light

❖ Light from most sources has electric and magnetic

fields that show at all angles

Polarization

❖ Light is polarized when the all of the electromagnetic

waves are transmitted at the same angle.

Everything is aligned.

❖The vibrations of the electric and magnetic fields are

parallel to each other.

Polarization

¤Light can be polarized in two ways:

¤Transmission: allows only waves of a certain angle to

pass through.¤Like glare off of glass or shiny objects.

¤Reflection: most waves of light bouncing off of a surface are polarized

parallel to that surface

¤Like glare off of glass or other shiny objects.

Polarization: Applications

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Polarization. (n.d.). Polarization. Retrieved October 29, 2013, from

http://www.physicsclassroom.com/class/light/u12l1e.cfm

How Sunglasses Work. (n.d.). HowStuffWorks. Retrieved October 29, 2013, from

http://science.howstuffworks.com/innovation/everyday-innovations/sunglass5.htm

Molecular Expressions Microscopy Primer: Light and Color - Polarization of Light. (n.d.). Molecular Expressions Microscopy

Primer: Light and Color - Polarization of Light. Retrieved October 29, 2013, from

http://micro.magnet.fsu.edu/primer/lightandcolor/polarizedlighthome.html

Color. (n.d.). HowStuffWorks. Retrieved October 29, 2013, from http://science.howstuffworks.com/color-info.htm