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46 Cards in this Set

  • Front
  • Back
EM wave
Oscillating electric and magnetic fields
Direction of the waves oscillation
Speed of light in vacuum
3*10^8 m/s
Visible light from lowest frequency (longest wavelength) to highest frequency (shortest wavelength)
Photon Energy
E = hf = h* c/wavelength
Law of Reflection
Angle of reflection = angle of incidence
Angle of reflection and incidence are measured with respect to ..
bending of the light
Index of refraction
n = speed of light in vacuum/speed of light in medium
Can n be less then 1?
No, always more then 1, 1 for vacuum and air
Law of Refraction
n1 sin incidence angle= n2 sin refracted angle
If n2>n1
ray will bend toward normal
ray will bend away from normal
Total internal reflection
All of the incidents ray intensity is reflecte (no refraction) if incident angle exceeds critical angle
Critical angle
Sin critical angle = n2/n1
For total internal reflection to occur
n1 must be greater then n2
Surface that forms an image of the object by reflecting light
In the mirror object is
same size, upright, not inverted, appears to be as far behind mirror as object in front of it
Concave mirror
Bends toward the subject
Convex mirror
bends away from the subject
Focal point
Halfway to the center of curvature
Radius of curvature, r
distance between center of curvature and mirror
Focal length
1/2 radius of curvature
Mirror Equation
1/o + 1/i= 1/f
o - objects distance from mirror
i - images distance from mirror
Real image
if i >0
Virtual image
if i<0
Magnification equation
m = - i/o, m- magnification factor
Height of image
height of object * m
Upright image
Inverted image
Real images are
Virtual images are
f for concave mirror
f for convex mirror
thin piece of glass or plastic that that forms an image by refracting light
Converging lenses
thicker in the middle, focal point on the other side of lens, image toward the focal point
Diverginf lenses
thicker in the ends, focal point in front of lens, image away from focal point
f for converging lens (convex)
f for diverging lens (concave)
Real images for lenses
on the other side of lens, inverted
Virtual images for lenses
on the same side as object, upright
Lens Power
units of f
Units of power
D, diopter
Lenses for nearsightedness
Lenses for farsightedness