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//Chapter 3, Example 3.5, page 74
clc
//Initialisation
No=1 //index of refraction
N1=1.3*10**-7
h=20 //height
//Calculation
wc=asin(((4*No)/((4*No)+((h**2)*N1)))) //critical angle
//Results
printf("Critical angle = %f",wc) //answer is not written in textbook
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