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clear
//
//
//
//Variable declaration
n=4000 //number of lines/cm
lamda=5000*10**-8 //wavelength(cm)
k=3 //order
//Calculation
e=1/n
sintheta=k*lamda/e
costheta=sqrt(1-sintheta**2)
dthetabydlamda=k*n/costheta //dispersive power of grating
//Result
printf("\n dispersive power of grating is %0.3f ",dthetabydlamda)
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