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19 Cards in this Set

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  • Back
Poynting Vector
-The rate and direction in which an electromagnetic wave is transporting energy per unit area is described by a vector S
-Always perpendicular to both E and B, and has magnitude EBsin(theta)
Visible Light Spectrum
390*10^-9m --> 700*10^-9m
Index of Refraction
Compares the speed c of light in a vacuum to the speed v of light in a medium

n = c/v
Indices of Refraction for water and glass:
1.3, 1.5
Snell's Law
n1*sin(theta1) = n2*sin(theta2)
When light crosses into a new medium, the frequency ________ and the wavelength _____
same, changes
If the medium's n is higher, the wavelength ________
becomes shorter
Energy of a single photon
E = hf
Critical Angle
If the angle of incidence is large enough, the entire amount of photons will be reflected at the angle of refraction (angle of refraction = 90 degrees in snell's law)
Longer wavelengths move __________ through a medium
faster
Virtual Image
Doesn't actually exist outside the mind of the observer; no light rays emanate from the virtual image
If the center is thicker at its ends, it will _________ light
converge
Focal Length of a mirror:
f(mirror) = (1/2)*r

r = radius of curvature
What is the focal point of a lens affected by?
The refractive indices of the lens and the medium that the lens is in. Also, by the radii of curvature of both sides of the lens.
Power (P)
P = 1/f

in units of m^-1
Lateral Magnification
The ratio of the size of the image to the size of the object

m = -(di/do) = (hi/ho)
Angular Magnification
The angle occupied by the object (theta1) when at the near point, compared to the angle occupied by an image (theta2) of the object when in front of a lens

m(theta) = (theta2)/(theta1)
Thin Lens Equation
(1/f) = (1/do) + (1/di)
Read Pages 152-155
Physics, lecture 8, light and optics