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+//Example 7_5
+clc();
+clear;
+//To calculate number of reflections per meter  and total distance covered
+n1=1.5
+n2=1.49
+phi=asin(n2/n1)*180/%pi   //units in degrees
+a=25   //units in micro meters
+leng=2*a*tan(phi*%pi/180)   //units inmicro meters
+totalnum=10^6/leng
+printf("Total number of reflections is %d\n",totalnum)
+l=1  //units in meters
+distance=l*(sin(phi*%pi/180))
+printf("Total distance covered is %.4f Meters",distance)
+//in text book answer printed wrong as 1.006mcorrect answer is 0.9933meters