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clear
//
//
//
//Variable declaration
lamda=10.66*10^-6; //wavelength(m)
delta_lamda=10^-5*10^-9; //line width(m)
//Calculation
cl=lamda^2/delta_lamda; //coherence length(m)
//Result
printf("\n coherence length is %0.2f km",cl/10^3)
printf("\n answer varies due to rounding off errors")
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