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clear
//
//
//
//Variable declaration
lamda=6000*10**-8 //wavelength(cm)
n=1
mew=1.5 //refractive index
r=50*%pi/180 //angle of refraction(radian)
//Calculation
t=n*lamda/(2*mew*cos(r)) //least thickness of glass plate(cm)
//Result
printf("\n least thickness of glass plate is %0.2f *10**-5 cm",t*10**5)
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