science Flashcards
form of radiant energy,electromagnetic radiation visible to the eye
light
bouncing of light when it hits a surface
reflection
perpendicular line to the surface at the point of incidence
normal line
angle between the incident ray and the normal
angle of incidence
angle between the reflected ray and the normal
angle of reflection
what lines are on the same plane
the incident ray,reflected ray and the normal to the reflected surface
same is true for refraction
angle of incidence is equal to?
angle of reflection
type of surface reflectance,mirror like reflection of light,reflected on smooth surfaces
Specular Reflection or Regular Reflection
parallel light
rays is incident on a rough surface and it scatters in different places
Diffuse Irregular Reflection
what are 3 artificial sources of light
bulbs, lambs,LEDS
is the bending of light as it passes through a transparent object
refraction
property of a given medium to slow down or delay the transmission of light
optical density
speed of light in a vacuum(c)
3x10^8 m/s
speed of light in water(c)
2.24x10^8 m/s
speed of light in glass(c)
1.88x10^8 m/s
index of refraction(n) equal
speed of light(c)/speed of light(v)
n=c/v
equation if the medium is underwater
n=actual depth/apparent depth
a ray entering an optically denser medium bend in which direction?
toward the normal
a ray entering aless dense medium bends where?
away from the normal
a ray oriented along the normal does what
does not bend
what is constant and independent of the angle of incidence
index of refraction of a particular medium
dutch astronomer and mathematician
willebrord snell
determined the relashonship of the angle of incidence and angle of refraction
willebrord snell
fill in the blanks
Snell’s law is defined as:
The ratio of the_______
_______ to the________ is a constant,
for the light of a given color and
for the given pair of media”.
sine of the angle of incidence and sine of the angle of refraction
when did snell discover his law
1621
a relationship relating the index of refraction in a given medium and the incident light angle to the index of refraction in the new medium
snell’s law
formula for snell’s law
n1sin theta1=n2 sintheta2
where n is the index of refraction in 2 different mediums
and theta is t
true or false
is light a wave?
true
is light an electromagnetic wave?
true
true or false
do all objects produce light
true
splitting up of white light into 7 colors as i passes through a prism
dispersion
when a beam of white light shoots through a prism it is called?
spectrum
range of colors of light
name 3 of the colors of the spectrum
run* red-longest wavelenght,lowest frequency
off* orange
you* yellow
girlsgreen
boysblue
in* indigo
view* violet-shortest wavelength,highest frequency
acronym for easy memorization
what was newton’s experiment
to show that white light consists of colours
range of radiation
electromagnetic spectrum
what is the electro magnetic spectrum
raja’s* radio wave-lowest frequency,longest wavelenght
mother* microwave
is* infrared wave
visisting* visible light
uncle* ultraviolet rays
xavier’s* x-rays
garden* gamma rays-highest frequency ,shortest wave lenght
acronym for easy memorizing
natural spectrum appearing in the sky after a rainshower,caused by the dispersion of sun light by tiny water droplets
always appears opposite of the sun
rainbow
do not need matter to transfer energy
made by vibrating electric charges and can travel through space by vibrating electric or magnetic fields
electromagnetic waves
true or false
do all things emit Fm waves
false,they emit EM waves
wavelengths become what as temperature increases
shorter
wavelengths carry what?
radiant energy
higher frequency=_____=_____
higher energy=higher temperature
what light has the longest wavelength but lowest frequency
red light
process where light coming from the sun travels through the earth’s atmosphere,the dust particles scatter the light in different directions
scattering of light
why is the sky blue
the sky is blue beacuse it is scattered by the particles and molicules in the air
bending of waves around a barrier or an obstruction
diffraction
glass or plastic made up of many tiny parallel slits
diffraction gratings
ex.CD surfaces
when two waves meet they have an effect on each other
interference
when the crest of a wave meets the crest of another wave
constructive interference
when the crest of a wave meets the trough of another wave
destructive interference
where we have this interference we have brighter bands of light
constructive interference
with this type of interference we get bands of darkness
destructive interference
process of exchanging information by transmiting light pulses over n fiber
optical fiber communication
hair thin cylindrical fiber of glass or any transparent dielectric medium,guide visible and infrared light over long distances
optical fiber
made from transparent dielectrics
fiber
used by many telecommunication companies to tranmit internet connection etc
optical fiber
light forms a what
electromgnetic wave modeled to carry information
