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clear
//
//
//
//Variable declaration
mew=1.5 //refractive index
lamda=5890*10**-10 //wavelength(m)
r=60*%pi/180 //angle of reflection(radian)
//Calculation
t=lamda/(2*mew*cos(r)) //smallest thickness of the plate(m)
//Result
printf("\n smallest thickness of the plate is %0.0f angstrom",t*10**10)
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