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+//Example1.7
+clc();
+clear;
+//To calculate the fring width
+//betaa=(lamda)/(2*alpha)
+lamda=6000 //units in armstrongs
+lamda=lamda*10^-8 //units in cm
+diameter=0.05 //units in mm
+distance=15 //units in cm
+alpha=(diameter/distance)*10^-1 //units in radians
+betaa=lamda/(2*alpha) //units in cm
+printf("The fringe width is %.2fcm",betaa)