- #1
Physgeek64
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Homework Statement
An interferometer is illuminated by light from a sodium lamp, which emits
two narrow spectral lines at wavelengths of 589.0nm and 589.6nm, with the intensity
of the 589.0nm line being twice that of the 589.6nm line. Show that there are values
of d at which the visibility of the interference pattern has minima, and calculate the smallest value on the optical axis, where θ = 0.
Homework Equations
##I=I_0(3+cos(2k_1 x cos\theta )+2cos(2k_2 x cos\theta ))##
minimum of first interference pattern when ##4d=n\lambda_1##
minimum of second interference pattern when ##4d=m\lambda_2##
The first minimum in intensity comes when ##n \lambda_1 = m \lambda_2##
However, i have no idea how to find the lowest values of m and n for which this occurs