# Ummm, what do these equations do

#### physics noob

hey, im look over some equations given to me by my instructor, and im reading the book and i cannot find what they do

k= 2(pi) / wavelength...................what is k

and theta_p = tan^-1 (n2/n1) what is theta_p

and dx/L = m(wavelength) what is d and x what does this find.....

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#### eep

'k' is called the wave number i think. if you freeze a wave in time, k is equal to how much the phase changes per meter. you can tell by the units. 2pi is in radians and wavelength is in meters so k = radians/meter

#### Pengwuino

Gold Member
First one is the wave number.

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