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+//chapter 44
+//example 7
+//given
+//clc()
+
+lambda=480*10^-9//in m
+d=0.10*10^-3//in m
+D=50*10^-2// in m
+a=0.02*10^-3
+delta_y=(lambda*D)/d
+disp("solution (a)")
+disp(delta_y,"D in m=")