0 Time υ = frequency λ = wavelength. Electromagnetic spectrum Visible light.
Light Electromagnetic Waves. Ray Model Speed of Light 220,000,000m/s.
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Transcript of Light Electromagnetic Waves. Ray Model Speed of Light 220,000,000m/s.
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LightElectromagnetic WavesElectromagnetic Waves
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Ray Model
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Speed of Light
220,000,000m/s
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Speed of Light (c)
c = 3.00 X 108 m/s(186,000mi/s)
c = λf
v = λf
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Homework 16-1
PP: 1-5 Pg: 376Ques: 1-4 Pg: 389Probs: 33-35 Pg:390
Due: 3/25/03
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Sources of Light
A Luminous body emits light waves!
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Sources of Light
An Illuminated body emits light waves!
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Luminous Flux (P)
The rate at which visible light is emitted
form a source.
Lumen: unit forluminous flux.
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Illuminance (E)
The illumination of a surface
lumens/square meter
lm/m2 or lux lx
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Inverse-Square Relationship
E 1/d2
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Luminous Intensity (candela cd)
Some light are measure in candela or candle power
Luminance Flux4π
P4π
=
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Illuminate a Surface
E = P4π d2
E: IlluminanceP: Luminous Flux
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Homework 16-2
PP: 6-11Section Review
Page: 381Due: 3/27/03
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Light and Color
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Visible Radiation(light):
Wavelength between 0.7 and 0.4m.
OpticsThe study of light and its uses.
ROYGBIVRed, Orange, Yellow, Green, Blue,
Indigo, Violet
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Light and Color
Transparent Material that
passes or transmits light.
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Opaque
Material that adsorbs light. No
light will pass through.
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Translucent
Materials that light will shine through, but you cannot see clearly through it.
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Primary Colors (light) Additive Colors
Red
Green
Blue
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Primary Additive Colors
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+ +
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PigmentsA colored material that absorbs certain colors and transmits or
reflects others. Pigment are suspensions.
Example: Paint
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Dye
A pigment that dissolves in a liquid to form
a colored solution.
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Primary Pigment Colors: Subtractive Colors
Yellow
Cyan
Magenta
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Subtractive Colors
WhiteWhite Blue
Absorbs:Red
Green
White Red
Absorbs:Blue
Green
White Green
Absorbs:BlueRed
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Primary Subtractive Colors
Pigments that absorbs one primary light color and reflects the other two.
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Primary Subtractive ColorsWhite Blue
Absorbs:Red
Green
Cyan
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Primary Subtractive ColorsWhiteWhite Red
Absorbs:Blue
Green
Yellow
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Primary Subtractive ColorsWhiteWhite Red
Absorbs:Green
Blue
Magenta
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Complementary Colors
Yellow Blue
Magenta Green
Cyan Red
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Thin-Film Interference
} λ/4 Red
3λ/4
5λ/4
Constructive Interference
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Polarization of Light
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Color Blindness
The color receptors in the eyes (cones) do not function
correctly.
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Inherited Condition 8% of Men
½% of women
Ability to distinguish between colors.
Primarily red and green.Green cones are deficient.
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25
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29
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45
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56
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6
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8
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Homework 16-3
Review 16-2 Wrap UpPage: 388
Problems: 31-39 oddPage: 390
Due: 3/31/03
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Homework 4-22
Section 19-2 Wrap UpPage: 541Worksheet
Due 5/29/01
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Battle of the Bulbs
Incandescent Light Light produced by a
thin wire called a filament.
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Fluorescent Light
Light produced the collision of electrons. These collisions
produce UV radiation, which is absorbed by the coating
around the bulb. UV is converted into visible light.
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Fluorescent Light Bulb
Pin Electrode
MercuryLead-inWire
Gas PhosphorescentCoating
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e
PhosphorescentCoating
Ultra-VioletRadiation
Electron and MoleculeCollide
WhiteLight
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Homework 4-23
Section 19-3 Wrap UpPage: 545WorksheetDue 6/1/01
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Wave Properties of Light
Reflection
Reflection occurs when a wave strikes an object and
bounces off.
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Reflection
i r
i:angle of incidence r:angle of reflection
i = r
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Refraction
The bending of waves. When waves go from one
material to another it changes speed. This will cause the light to bend.
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Refraction
Air
Glass
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Refraction
Prism
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PrismThe amount that light is diffracted depends on its wavelength. Shorter
wavelengths are bent more than longer wavelengths. Violet is
bent more than Red!!!
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Diffraction The bending of a wave as it passes
through an opening or around the edge of an object.
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Interference
Interference occurs when two or more waves come together. When
two crests or two troughs come together we get a bright line. When a crest and a trough come together
we get a dark line.
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Constructive
Interference
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Destructive
Interference
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Diffraction Grating
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Homework 4-24
Section 19-4 Wrap UpPage: 550
Voc. Page: 553Due 6/5/01
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H
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Homework 4-25
Checking ConceptsPage: 554WorksheetDue 6/6/01Test: 6/8/01
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Homework 4-26
Review 11-25Page: 553-554
Due: 6/7/01Test: 6/8/01