OSU Ph 212 2nd midterm
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The index of refraction
n = c/v
 n = optical density (n=>1)
 c = speed of light == 3.00 *10^{8}
 v = the apparent spped of light in a material (v<=c)

Intensity
Intensity is the power contained within the wave divided by the surface over the wave moves
power tells you the most information
I = P / A
 I = intensity
 P = power
 A = area

intensity
expands in all directions Area is
Area = 4πr^{2
}Area of a sphere^{}

Intensity
Expands in one direction Area is
Area = 2πr^2
Area of a hemisphere

Intensity
Doesn't expandes Area is
Area = πr^{2}

Inverse Square Law
is any physical law stating that some physical quantity or strength is inversely proportional to the square of the distance from the source of that physical quantity.

Log_{x} (A*B) =
= (log_{x}A) + (log_{x}B)
= 10^{A}*10^{B }== 10^{A+B}

Log_{x}(A/B) =
= Log_{x}(A)  Log_{x}(B)
= (10^{A})/(10^{B}) == 10^{AB }

Log_{x}(A^{n}) =
= n(log_{x}(A))
_{10}A^{n} == 10^{A*n}

Change in base log
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