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clear
//
//
//
//Variable declaration
theta=15*%pi/180 //angle(radian)
lamda=6500*10**-8 //wavelength(cm)
n=1 //order
//Calculation
a=n*lamda/sin(theta) //slit width(cm)
//Result
printf("\n slit width is %0.2f *10**-4 cm",a*10**4)
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