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+//Chapter 3, Example 3.2, page 63
+clc
+
+//Initialisation
+h=2 //Height in Km
+T=277 //Tempreture in Kelvin
+p=716
+e=2
+
+
+//Calculation
+er=1+(151.1/T)*(p+(4810*h/T))*10**-6
+n=er**(0.515) //refractive index of the air
+N=(n-1)*10**6 //refractivity number
+
+
+//Results
+printf("n = %.5f",n)
+printf("\nN = %d",N)