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+//Example 3.5, Page Number 123
+//Phase Matching Angle
+clc;
+
+//The following values have been taken from the table on page no 123
+no1=1.4943//no for l=1.06
+no2=1.5132//no for l=0.53
+nc=1.4712//nc for l=0.53
+t2=((no1**-2)-(no2**-2))/((nc**-2)-(no2**-2))
+theta=asin(t2)
+
+//Converting it into degrees
+degrees=theta * (180/%pi)  //theta is the phase matching angle
+
+mprintf("The Phase matching angle is %d degrees",degrees);