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Terms in this set (29)
can be REFLECTED when it strikes an obstacle.
the path of waves is often bent when they cross a boundary between 2 mediums.
the speed of light in a vacuum
is always constant.
light travels significantly slower when traveling through a material medium.
about 0.1 % slower in air than in a vacuum.
25 % slower in water.
33% in glass.
60 % slower in diamonds.
light may also
be bent when it passes through glass.
a principle used in eye glasses, contacts, cameras, and binoculars.
a piece of glass or other substance specially designed to refract light.
bulges outward and causes rays of light passing through it to bend inward.
magnify objects and are used to correct farsightness(presbyopia).
refracted light waves
always bend toward the medium that slows them down.
occurs when light rays from a distant object are refracted by heater air so that the object appears nearby.
most common: appearance of water on a paved road on hot summer days.
semicircular arc of colored bands of light in the sky.
usually in the morning or afternon when the sun is at an angle.
the spreading out of a wave as it passes by an obstacle or through a narrow gap.
of visible light in a increasing frequency.
red orange yellow green blue violet.
produces spectrums in the lab because diffraction produces a purer spectrum than refraction by a glass prism.
the mutual reinforcement or cancellation that occurs when 2 waves meet.
the process by which color are produced by interference when light is reflected.
a beam of light containing waves that all vibrate in the same direction is said to be.....
methods of polarization
photons given off
stimulated 2 normal emissions.
hollowed inward and causes rays of light passing through it to bend inward.
spreads light(shrinks images), objects appear much distant.
used to correct nearsightness(myopia).
rainbow is prism
raindrops have cruneeds (ides) is prenial.
light is refracted 1st as it enters the raindrop from one side os reflected internally as it strikes the opposite wall, and is refracted a 2nd time as it exists the drop.
light rays emerges on the same side that it entered.
this explains why the rainbow is seen in the opposite sky from the sun.
sometimes seen 8 to the second higher in the sky than the primary raibow.
results from light rays that are reflected twice within the droplet instead of one.
the colors are in the opposite order as the primary rainbow.
= 2 waves, electric and magnetic vibrating at right angles to each other.
diffraction waves of light
dont always vibrate in the same plane.
electric may vibrate
vertical when magnetic may vibrate horizontal.
methods of polarization
reflection occurs naturally, sun light off a body of water, wind, heat, and light reflecting ssurfacce is horizontal,
the beam will become polarized in the horizontal direction.(vertical).
invoves using a specific filter to absorb any light waves that are not vibrating in the desired plane.
the light vibrating in an uncertain plane is always to pass through the filter.
the beam of light that emerges from the filter is polarized in a single direction.
employeed by polarized sunglasses.
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