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clear
//
//
//
//Variable declaration
lamda=5890*10**-5 //wavelength(cm)
dlamda=6*10**-5 //difference in wavelength(cm)
k=2 //order
w=2.5 //width(cm)
//Calculation
N=lamda/(k*dlamda*w) //minimum number of lines per cm
//Result
printf("\n minimum number of lines per cm is %0.2f ",N)
printf("\n answer given in the book varies due to rounding off errors")
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