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+//chapter8,Example8_5,pg 182
+
+//since both reflections occur at surface of denser medium
+
+//condition for brightness for min thickness, n=1
+
+//for normal incidence r=0, cos(r)=1
+
+lam=5500*10^-8
+
+V=0.2
+
+A=100*100//converting into cm2
+
+t=V/A
+
+u=lam/(2*t)
+
+printf("RI of oil\n")
+
+printf("u=%.2f",u)
+\ No newline at end of file