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+//Example 1_13
+clc();
+clear;
+//To calculate the fringe width
+D=0.005 //units in mm
+d=15 //units in cm
+lemda=6000 //units in angstroam
+lemda=6000*10^-8 //units in cm
+alpha=D/d //units in radians
+beta=lemda/(2*alpha)
+printf("fringe width is %.2f cm",beta)