Presentation on theme: "18.3 Key Concepts What three types of materials affect the"— Presentation transcript:
1 18.3 Key ConceptsWhat three types ofmaterials affect thebehavior of light?How does light behavewhen it enters a newmedium?
2 Without light _______________ is visible. You can see reef animals through water because light ___________ through the water between the reef and your _________.nothingpasseseyes
3 ______________________ Light and MaterialsHow light behaves when it strikes an object depends on many factors, including the __________________ the object is made of…Materials can be…______________________materialtransparenttranslucentopaque
4 Light and MaterialsA transparent material _____________ light, which means it allows __________ of the light that strikes it to pass through it..transmitsmostThe water where thefish and coral live istransparent.
5 Light and Materials.While riding on a bus, you can see buildings and trees outside because the bus ______________ are transparent.windows
6 A translucent material ____________ light. Light and MaterialsA translucent material ____________ light.As a result, the objects you see through it look ____________ or may lack _______________; as opposed to clear or distinct.scattersfuzzydetail
7 __________ materials are opaque. An opaque object does ______ Light and MaterialsAn opaque material either ___________ or ______________ all of the light that strikes it.__________ materials are opaque.An opaque object does __________________ any light to passthrough it.absorbsreflectsMostnotallow
8 When light strikes a _________ medium, the light can be… Interactions of LightWhen light strikes a _________ medium, the light can be…__________________If transmitted, or _________________, it can be refracted, polarized, or scattered.newreflectedabsorbedtransmittedpassed through
9 Interactions of LightRecall that when light encounters matter, some or all of the energy in the light can be ________________ to the matter.Just as light can affect matter, _____________ can affect _____________.transferredmatterlight
10 Interactions of Light Reflection An ____________ is a ____________ of an object formed by reflected (or refracted) waves of light.Regular reflection occurs when parallel light waves strike a surface and reflect all in the __________ _____________________Diffuse reflection occurs when parallel light waves strike a ____________, uneven surface and reflect in many ________________directions.imagecopysamedirectionroughdifferent
11 Which example is regular reflection? And diffuse reflection? Interactions of LightWhich example is regular reflection? And diffuse reflection?regulardiffuse
12 Interactions of Light Refraction A light wave can refract, or ____________, when it passes at an ______________ from one medium into another.Refraction makes underwater objects appear _______________ and larger than they really are.Refraction can also make an object appear to _____________ at the surface of the water.bendanglecloserbreak
13 Interactions of LightBecause the light bends, the image you see appears to be bent as well.
14 Interactions of LightRefraction can also sometimes cause a ______________, a false or distorted image.Mirages occur because light travels ______________ in ________ air than in cooler, denser air.Refraction causes some of the light to follow a __________________ path, rather than a straight path to the ground.Light that reaches your eyes after traveling in this manner can look as if it was reflected from a layer of ____________________.miragefasterhotcurvedwater
15 Light is refracted by hot air ___________ it reaches the ground before
17 Interactions of Light Polarization Light with waves that vibrate in only ________ ___________ is polarized light.Polarized light may occur when light reflects from a ________________ flat surface, such as a…__________________surface of a _______________oneplanenonmetallicwindowlake
18 Horizontally polarized light reflects more Interactions of LightPolarizationHorizontally polarized light reflects more____________ than the rest of the sunlight,producing a _________________Polarized _________________ have verticallypolarized _______________ to block thehorizontally polarized light.stronglyglaresunglassesfilters
19 Interactions of LightA vertical polarizing filter blocks light that is __________________ polarized.horizontallyVertical polarizing filterHorizontal polarizing filterVertical wave is blockedHorizontal wave is blockedVertical wave passes through filter.
20 ScatteringIn scattering, light is ____________________ as it passes through a medium.Most of the particles in the atmosphere are very _____________.Small particles scatter ________wavelength _________ light morethan light of longer wavelengths.Blue light is scattered in alldirections more than other colorsof light, which makes the _________ appear blue.redirectedsmallshorterbluesky
21 A scattering effect reddens the sun at ___________ and ______________ Interactions of LightA scattering effect reddens the sun at ___________ and ______________When the sun is close to the horizon, sunlight travels ____________________ through the atmosphere.By the time the sunlightreaches your eyes, most______________-wavelengthlight has been scattered.The remaining light consistsmostly of ____________ wavelength reds and orangessunsetsunrisefarthershorterlonger
22 How do polarized sunglasses reduce glare? Assessment QuestionsHow do polarized sunglasses reduce glare?by scattering light as it passes through the glassesby providing a smooth surface that light can reflect offby absorbing all lightby blocking horizontally polarized light
23 Assessment Questions2. An opaque material passes light through but scatters the light so that objects do not look clear. True False
24 3. The following picture is an example of… Assessment Questions3. The following picture is anexample of…ReflectionRefractionPolarizationScattering