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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)
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