Unit 10: Light, Mirrors, and Color Flashcards
electromagnetic wave
wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light
how are the electric and magnetic fields of light oriented relative to each other
they are at right angles to each other
value for the speed of light
C=3.00 x 10^8 m/s
equation for speed of a light wave
c=f(lambda)
speed of light = (frequency)(wavelength)
the intensity of light depends on what two things
the amount of light energy emitted from a source
the distance from the light source
illuminance decreases as
the radius squared as u move
away from a light source
reflection
change in direction of an electromagnetic wave at a surface that causes it to move away from the surface
what does a surface’s smoothness determine
the manner in which might is reflected
diffuse or specular
diffuse reflection
when light is reflected from a rough textured surface
specular reflection
when light is reflected from a smooth surface
what is the relationship between the angle of an incoming Ray and the angle of the reflected ray
they are equal
variable used for object distance
p
variable used for image distance
q
virtual image
an image that forms at a point from which light rays appear to come but do not actually come
concave spherical mirror
segment of the inside of a sphere
goes inward
if the image is larger than the object the magnitude of magnification is
greater than 1
convex spherical mirror
curves outward
why does a convex mirror always have a negative focal length
the resulting image is always virtual
what two things does an objects color depend on
wavelengths of light shining on the object
wavelengths of light that are reflected
primary additive colors
red
blue
green
what do pigments rely on
the colors of light that are absorbed or subtracted from the incoming light
three primary pigments
magenta
yellow
cyan
six elementary colors of the visible spectrum
red Orange yellow green blue violet
linear polarization
alignment of electromagnetic waves in such a way that the vibrations of the electric fields in each of the waves are parallel to each other
what happens if two polarizing films are held with their transmission axes perpendicular to each other
no light will pass through the films
which portion of the electromagnetic spectrum is used in TV
Radio waves
which portion of the electromagnetic spectrum is used to identify fluorescent minerals
ultraviolet light
when red light is compared with violet light
they both travel at the same speed
red end of spectrum
low frequency
high wavelength
blue end of spectrum
high frequency
low wavelength
subtraction is used with
pigments
order of waves from largest to smallest
radio
micro
infrared
visible
do all wavelengths travel at the same speed
ya
the farther light is from a source
the more spread out light becomes
a highly polished finish on a new car provides a ____ surface for ____ reflexion
smooth and specular
what type of mirror is used whenever a magnified image of an object is needed
concave mirror
