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clear
//
//
//
//Variable declaration
lamda=5*10**-5 //wavelength(cm)
k=2 //order
theta=30*%pi/180 //angle(radian)
//Calculation
e=k*lamda/sin(theta) //number of lines(cm)
n=1/e //number of lines per centimeter
//Result
printf("\n number of lines per centimeter is %0.3f ",n)
printf("\n answer given in the book is wrong")
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