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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)
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