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57 terms

Ligh+ Fla$hc@rd$

STUDY
PLAY
light
range of frequencies of electromagnetic waves that stimulates the retina of the eye
ray model
straight-line path of light
luminous
a body that emits light waves
illuminated
body that reflects light waves from an outside source
luminous flux
rate at which visible light is emitted from a source
lumen
unit of luminous flux
illuminance
illumination of a surface
lux
lumens per square meter
candela
candle power
luminous intensity
the luminous flux that falls on 1m2 of a sphere 1m in radius
transparent
transmit light without distortion
translucent
transmits light but does not permit objects to be seen clearly
opaque
transmits no light, but absorbs or reflects all light
spectrum
ordered arrangement of colors from violet to red
primary colors
red light, blue light, green light,
secondary colors
yellow, cyan, magenta
complementary colors
any color made up of two primary colors
dye
a molecule that absorbs certain colors and transmits other
pigment
a colored material that absorbs certain colors and reflects others
primary pigment
a pigment that only absorbs one color from white light
secondary pigment
a pigment that absorbs two primary colors and transmits one.
thin-flim interference
constructive and destructive interference of light waves
polarized
a light that is produced by a polarizing material
regular reflection
light is reflected back in parallel beams.
diffuse reflection
light that is reflected but not image not easily seen.
angle of refraction
angle that the refracted ray makes with the normal to the surface
optically dense
angle of refraction smaller than the angel of incidence
Snell's law
ratio of the sine of the angle of incedence to the sine of the angle of refraction is a constant
index of refraction
light going from vacuum to another medium, the constant n,
total internal refraction
when light reflects completely off the inside wall of a denser medium rather than passing through the wall into a less dense medium
critical angle
the smallest angle of incidence for which light is totally reflected
dispersion
the separation of light into its spectrum
plane mirror
a mirror with a flat surface, light is reflected by regular reflection
object
a source of spreading light rays
image
the image further than what it really is.
virtual image
rays that dont converge at a point
erect image
a mirror image that points in the same direction as the reflected object
concave mirror
reflects light from its inner surface
principal axis
a straight line perpendicular to the surface of a mirror that divides the mirror in half
focal point
parallel rays meet at F
focal length
the distance from the focal point to the mirror along the principal axis
real image
rays that actually converge and pass through the image
virtual image
cannot be projected onto a screen or captured on a piece of paper
lens/mirror equation
1/f=1/di+1/do
magnification
the ratio of the size of the image, hi, to the size of the object, ho
spherical aberration
the image formed by parallel rays in a large spherical mirror
convex mirror
spherical mirror that reflects light from its outer surface
lens
made up of transparent material with a refractive index larger than than of air
convex lens
thicker at the center than the edges
concave lens
thinner in the middle than at the edges
chromatic aberration
object viewed through a lens appears ringed with color.
achromatic lens
lens that converges the light
interference fringes
a pattern of bright and dark bands
monochromatic light
emits only one wavelength
coherent waves
when wave crests and troughs reach same point at the same time.
diffraction grating
a device that transmits light and forms an interference pattern in the same way that a double slit does
rayleigh criterion
central bright band of one star falls on the first dark band of the second.