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+//Example 1.5 // distance between coherent source
+clc;
+//given data :
+b=9.424D-4;//fringes width in m
+w=5890D-10;// wavelength in m
+a=0.05;// distance between source & prism in m
+c=0.75;// distance between prism & screen in m
+D=a+c;//distance between source and screen in m
+d=(D*w)/b;//distance between coherent source
+disp(d,"distance between coherent source in meter")