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clear
//
//
//
//Variable declaration
lamda1=4200*10**-10 //wavelength(m)
beta11=0.64*10**-2 //first fringe width(m)
beta12=0.46*10**-2 //second fringe width(m)
//Calculation
lamda2=lamda1*2*beta12/beta11 //wavelength of light source(m)
//Result
printf("\n wavelength of light source is %0.3f angstron",lamda2*10**10)
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