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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