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clc
//
//
//
//Variable declaration
lambdaa=5000*10**-8 //Wavelength
theta=30 //Angular Width
//Calculations
thetarad=((%pi/180)*(theta))
invde=((2*lambdaa)/(sin(thetarad)))**-1
//Result
printf("\n The number of line cm in grating is %0.3f ",invde)
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