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//Variable declaration
D15=0.59*10**-2; //diameter of 15th ring(m)
D5=0.336*10**-2; //diameter of 5th ring(m)
R=1; //radius(m)
m=10;
//Calculation
lamda=((D15**2)-(D5**2))/(4*m*R); //wavelength of light(m)
//Result
printf('wavelength of light is %0.3f angstrom \n',int(lamda*10**10))
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