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//chapter8,Example8_7,pg 183
ug=1.5
uo=1.3
//here reflection occurs both time at surface of denser medium
//condition for distructive interference in reflected side
//2*u*t*cos(r)=(2*n-1)(lam1/2), for nth min.
r=0
//for nth min.
//2*u*t=(2*n+1)(lam1/2), n=0,1,2,3
//for (n+1)th min.
////2*u*t=(2*(n+1)+1)(lam2/2), n=0,1,2,3
lam1=7000*10^-10
lam2=5000*10^-10
//from eq. of nth and (n+1)th min.
t=(2/(4*uo))*((lam1*lam2)/(lam1-lam2))
printf("thickness of layer\n")
printf("t=%.12f m",t)
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