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+//chapter8,Example8_9,pg 184
+
+alpha=((%pi*10)/(60*60*180))//converting into radian
+
+B=0.5//fringe width
+
+u=1.4
+
+lam=2*B*alpha*u
+
+printf("wavelength of light used\n")
+
+printf("lam=%.12f m",lam) \ No newline at end of file