05 13 2010 get2 report

8/9/2019 05 13 2010 get2 report

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ScatteringScattering- - light waves get their directionlight waves get their directionchanged by the molecules and dust particles inchanged by the molecules and dust particles in

the air.the air.

WavelengthWavelength -- a measure of the distancea measure of the distance

between the crests of the waves.between the crests of the waves.

WaveWave -- means by which energy travelsmeans by which energy travels

Electromagnetic RadiationElectromagnetic Radiation- - is ais aphenomenon that takes the form of self phenomenon that takes the form of self propagating waves in a vacuum or in matter.propagating waves in a vacuum or in matter.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


Light Light -- refers torefers toelectromagneticelectromagnetic

radiation of anyradiation of anywavelength, weatherwavelength, weather

visible or not.visible or not.

8/9/2019 05 13 2010 get2 report


White light from the sunWhite light from the sunpasses through air fairlypasses through air fairly

well, but there is a lot of well, but there is a lot of air between here and theair between here and the

outer reaches of theouter reaches of theatmosphere & some of atmosphere & some of the light gets scattered.the light gets scattered.

8/9/2019 05 13 2010 get2 report


P roperties of P roperties of Wave MotionWave Motion

(explain how wave moves)(explain how wave moves)

8/9/2019 05 13 2010 get2 report


1 .Diffraction1 .Diffraction-- is when ais when awave goes through awave goes through asmall hole & has a flaredsmall hole & has a flaredout geometric shadow of out geometric shadow of the slit the slit

-- a characteristics of a characteristics of

waves of all types.waves of all types.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


2 . Reflection2 . Reflection-- is whenis whenwaves, whetherwaves, whetherphysical orphysical orelectromagnetic,electromagnetic,

bounce from a surfacebounce from a surfacebackward the source.backward the source.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


3 . Refraction3 . Refraction- - is when waves,is when waves,

whether physical orwhether physical orelectromagnetic areelectromagnetic are

deflected when the wavesdeflected when the wavesgo through a substance.go through a substance.

The waves generallyThe waves generallychanges the angle of itschanges the angle of its

general direction.general direction.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


ColorColor -- is the visual perceptual propertyis the visual perceptual propertycorresponding in humans to the categoriescorresponding in humans to the categoriescalled red, green, blue, and others,called red, green, blue, and others,-- it derives from theit derives from the spectrum of light spectrum of light interacting in the eye with the spectralinteracting in the eye with the spectral

sensitivities of the light receptors.sensitivities of the light receptors.Spectrum of light Spectrum of light- - distribution of light energydistribution of light energy

versus wavelength.versus wavelength.

Cone CellsCone Cells-- are photoreceptors cells in theare photoreceptors cells in theretina of the eye that function best in relativelyretina of the eye that function best in relativelybright light. It allow the perception of color.bright light. It allow the perception of color.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


Color in the EyeColor in the Eye

3 Types of 3 Types of Cones(color vision at the level of retina)Cones(color vision at the level of retina)

Violet Violet-- most responsive to light/most responsive to light/ SWCSWC

-- misleadinglymisleadingly BLU E CON ESBLU E CON ESyellowyellow-- most sensitive to light/most sensitive to light/ LWCLWC

-- misleadinglymisleadingly RED CON ESRED CON ESGreenGreen-- middle wavelength conesmiddle wavelength cones

8/9/2019 05 13 2010 get2 report


This image (when viewed in full size, 1000 pixels wide) contains 1 This image (when viewed in full size, 1000 pixels wide) contains 1 million pixels, each of a different color. The human eye canmillion pixels, each of a different color. The human eye candistinguish about 10 million different distinguish about 10 million different

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


A dominant theory of color vision proposes that A dominant theory of color vision proposes that color information is transmitted out of the eyecolor information is transmitted out of the eyeby threeby three opponent processesopponent processes , or opponent , or opponent

channels, each constructed from the rawchannels, each constructed from the rawoutput of the cones: a redoutput of the cones: a red- -green channel, agreen channel, ablueblue--yellow channel and a blackyellow channel and a black- -whitewhite"luminance" channel."luminance" channel.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


Color of the O bject Color of the O bject

-- Depends on both the physics of theDepends on both the physics of theobject in its environment and theobject in its environment and thecharacteristics of the perceiving eyecharacteristics of the perceiving eyeand brain.and brain.

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


If O bjects scatter all wavelength,If O bjects scatter all wavelength,they appear whitethey appear white

If they absorb all wavelenght,If they absorb all wavelenght,

they appear blackthey appear black

8/9/2019 05 13 2010 get2 report


Sun During the DaySun During the Day

Shorter the angle, the longer waves pass straight Shorter the angle, the longer waves pass straight throughthrough

While the shorter waves get hung up onWhile the shorter waves get hung up onparticles in the atmosphereparticles in the atmosphere

Sun Rise, Sunset Sun Rise, Sunset

The longer the angle, the shorter light wavesThe longer the angle, the shorter light wavesnever reach the lower areasnever reach the lower areas

8/9/2019 05 13 2010 get2 report


8/9/2019 05 13 2010 get2 report


The formation of a rainbow involves a series of physical phenomenaThe formation of a rainbow involves a series of physical phenomena - -reflection, refraction, dispersion and total internal reflectionreflection, refraction, dispersion and total internal reflection ..The occurence of each of these is due to the interaction of lightThe occurence of each of these is due to the interaction of lightwith air and water and the boundaries between them.with air and water and the boundaries between them.

05 13 2010 get2 report

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