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clear
//
//
//
//Variable declaration
mew=1.33 //refractive index
i=35*%pi/180 //angle of incidence(radian)
d=5*10**-5 //thickness(cm)
n1=1 //order
n2=2 //order
n3=3 //order
n4=4 //order
//Calculation
r=180/%pi*asin(sin(i)/mew) //angle of reflection(degrees)
lamda1=2*mew*d*cos(r)/n1 //wavelength of light for 1st order(cm)
lamda2=2*mew*d*cos(r)/n2 //wavelength of light for 2nd order(cm)
lamda3=2*mew*d*cos(r)/n3 //wavelength of light for 3rd order(cm)
lamda4=2*mew*d*cos(r)/n4 //wavelength of light for 4th order(cm)
//Result
printf("\n wavelength of light for 1st order is %0.1f *10**-5 cm",lamda1*10**5)
printf("\n answer in the book varies due to rounding off errors")
printf("\n wavelength of light for 2nd order is %0.2f *10**-5 cm",lamda2*10**5)
printf("\n wavelength of light for 3rd order is %0.2f *10**-5 cm",lamda3*10**5)
printf("\n wavelength of light for 4th order is %0.1f *10**-5 cm",lamda4*10**5)
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