1026/CH8/EX8.4/Example8_4.sce


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//chapter8,Example8_4,pg 182

i=45*(%pi/180)

u=1.33

r=asin(sin(i)/u)

r=r*(180/%pi)

//for bright fringe 2*u*t*cos(r)=(2*n+1)(lam/2)

//for minimum thickness n=0

lam=5000*10^-8

t=lam/(4*u*t*cos(r))

printf("min. thickness of film\n")

disp(t)