bellwork what is a photon? what is a photon? * turn in the em vocab assignment * a wave packet of an...
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Light Polarization Light Polarization: The alignment of EM waves where their electric fields are parallel Light Polarization: The alignment of EM waves where their electric fields are parallel Note: This is different from electrical polarization (sticking a balloon to the wall)TRANSCRIPT
BellworkBellwork What is a photon?What is a photon?* Turn in the EM Vocab * Turn in the EM Vocab
Assignment *Assignment * A wave packet of an EM A wave packet of an EM
radiation.radiation.
Today’s AgendaToday’s Agenda Light Polarization NotesLight Polarization Notes Lab ExtensionLab Extension Color NotesColor Notes
Light PolarizationLight Polarization Light PolarizationLight Polarization: The : The
alignment of EM waves where alignment of EM waves where their electric fields are their electric fields are parallel parallel
Note: This is different from Note: This is different from electrical polarization electrical polarization (sticking a balloon to the (sticking a balloon to the wall)wall)
Light PolarizationLight Polarization
Polarized Light
Light Polarization• Lightbulb – Nonpolarized• Smart Board – Split polarized• Monitor – Polarized
Lab Extension: The Lab Extension: The PrismPrism
Shine sunlight through the prism 50 Shine sunlight through the prism 50 cm off the ground on to a white cm off the ground on to a white sheet of paper placed on the ground.sheet of paper placed on the ground.
Draw the colors and bandwidths of Draw the colors and bandwidths of each coloreach color
Make Make fivefive observations of your observations of your findings. (colors, orientation, findings. (colors, orientation, relative band widths, etc.)relative band widths, etc.)
Colors4/28/14
Are you ready for a pop test?
Types of Color Blindness
Type DenominationPrevalence
Men Women
Monochromacy Achromatopsia (B/W) 0.00003%
Dichromacy
Protanopia (R/G) 1.01% 0.02%Deuteranopia (R/G) 1.27% 0.01%Tritanopia (B/Y) 0.0001%
Anomalous Protanomaly (R/G) 1.08% 0.03%Trichromacy Deuteranomaly (R/G) 4.63% 0.36%
Tritanomaly (B/Y) 0.0002%
Different forms of color vision deficiency
Normal, Red/Green (2), Blue/Yellow
The Color Spectrum• R – Red (longest wavelength / lowest frequency)• O – Orange• Y – Yellow• G – Green• B – Blue• I – Indigo• V – Violet (shortest wavelength / highest frequency)
White Light • White Light: Is the combination of all of
the colors of light (sunlight)
The Color Spectrum
Pigments
• Pigment: A material that selectively absorbs colors of light
Color by Transmission• Some light is
absorbed while other light is transmitted
Color Addition (Light)• Primary colorsRed, Blue, and Green• Combining colors (adding the primaries
together)Red + Green = YellowRed + Blue = MagentaBlue + Green = CyanRed + Green + Blue = White
Color Addition
Color Subtraction (Paints)• Primary colorsYellow, Red (Magenta), Blue (Cyan)• Combining colors (adding the primaries
together)Yellow + Red = OrangeYellow + Blue = GreenBlue + Red = Purple
Color Subtraction
Reflection• White –
reflects all light
• Black – absorbs all light
Color by Reflection
Color by Reflection• Illuminated with
white light • The object absorbs
all of the colors and reflect only yellow or green
Addition and Subtraction
Light Scattering• Light Scattering: the
deflection of a light ray from a straight path
(Rayleigh Scattering)
Light Scattering• Why is the sky blue and sunset red?
Blue Sky
Sunsets