16.2LIGHT AND MATTER

By: Kristi Trompower

Why It Is Important

Light is a primary sensor to how the universe behaves. From learning about the biological patterns on Earth to discovering the astronomic rules of outer space, scientists rely upon detecting light waves.

http://achemtutor.blogspot.com/

Transparent

Materials that transmit light waves without distorting images.

Objects can be clearly seen through: Air Glass Some plastics

Transparent. Technical Guides. Adobe, 2000. Web. 5 Jan. 2011. <http://dba.med.sc.edu/price/ irf/Adobe_tg/color/matter.html>.

Translucent

Materials that transmit light but do not permit objects to be seen clearly

Lamp shades Frosted light bulbs

Translucent. Technical Guides. Adobe, 2000. Web. 5 Jan. 2011. <http://dba.med.sc.edu/price/irf/Adobe_tg/color/matter.html>.

Opaque

Materials that transmit no light but absorb or reflect all light incident upon them.

Brick

Opaque. TutorVista. 2010. Web. 5 Jan. 2011. <http://www.tutorvista.com/physics/examples-of-opaque-objects>.

Color

How is the color pattern of a rainbow produced?

http://www.test.photographers-resource.com/photography/landscapes/Photographing_Rainbows.htm

Isaac Newton experimented on the colors when a narrow beam of sunlight passed through a prism.

http://www.yorku.ca/eye/newton.htm

Spectrum A spectrum is the ordered arrangement

of wavelengths. Rainbows (Violet to red) Each color in the spectrum has a specific

wavelength of light.

http://sammyholmes.wikispaces.com/

Color By Addition

http://www.yorku.ca/eye/3color.htm

Primary Colors

Colors from which other colors can be made.

1.Red 2.Green 3.Blue red & green = yellow blue & green = cyan red & blue = magenta

http://www.d.umn.edu/~mharvey/colorwheel.jpg

Secondary Colors

Colors formed when two primary colors are mixed.

yellow   (red & green) cyan      (blue & green) magenta (red & blue)

http://www.d.umn.edu/~mharvey/th1501color.html

Complementary Colors

Two colors of light that when added together produce white light.

1.Yellow is made from 2 primary colors. Red & Green = Yellow

White =  Blue & Yellow Red & Cyan Green & Magenta 

http://godbit.com/images/52.jpg

Colors By Subtraction

http://library.thinkquest.org/C003776/ingles/images/colors2.gif

Dye

A molecule that absorbs certain wavelengths of light and transmits or reflects others.

Tomatoes are red because it reflects light to our eyes.

http://greencotton.files.wordpress.com/2008/06/blog-dye-picture.png

Pigments

Colored materials that absorb certain colors and transmit or reflect others.

Like a dye but a pigment particle is larger than

a molecule can be seen with a microscope.

Primary Pigment

A pigment that absorbs only one primary color from white light.

1.Yellow      (absorbs blue; reflects red and green)

2.Cyan 3.Magenta

Secondary Pigment A pigment that absorbs two primary

colors and reflects one.

1.Red   (absorbs green & blue) 2.Green (absorbs red & blue) 3.Blue   (absorbs red & green)

Primary Pigments are the Secondary Light Colors.

http://www.tutornext.com/system/files/u84/Chapter-7.doc-6.gif

Formation of Colors in Thin Films

http://171.67.77.70/courses/cs348b-competition/cs348b-08/finals/soap.png

Thin-film Interference Light interference caused by reflection from the

front and back surface of a thin layer of liquid or solid.

Different colors have different wavelengths.

As thickness increases, light with shortest wavelength will be most strongly reflected.

1.Violet 2.Blue 3.Green 4.Yellow 5.Orange 6.Red**A rainbow of colors.**

http://electron9.phys.utk.edu/phys136d/modules/m9/film.htm

Polarization of Light

http://www.jcss.gr.jp/iccs99OLP/o3-04/o3-04.htm

Polarization

Light consisting of waves that vibrate on a specific plane.

http://micro.magnet.fsu.edu/optics/lightandcolor/polarization.html

The Ray and Wave Models of Light

The ray model explains how lenses and mirrors form images.

http://astronomy.libsyn.com/2006/04

Works Cited

Zitzewitz, Paul W. Physics Principles and Problems. 2002ed. New York: Glencoe, 2002. Print.