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//Example 1_18
clc();
clear;
//To calculate the smallest thickness of the plate
lemda=5890 //units in angstroam
lemda=5890*10^-10 //units in mts
u=1.5
n=1
r=60 //units in degree
t=(n*lemda)/(2*u*cos(r*%pi/180))*10^10
printf("Thickness of the glass plate is %.0f angstroam",t)
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