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clc;
clear;
f=400 //focal length of lens in cm
myu=1.50 //refractive index
lambda=5460*10^-6 //wavelength in cm
n=5 //fifth bright ring
//calculation
R=(myu-1)*2*f //radius of curvature in cm
D5=sqrt(2*((2*n)-1)*lambda*R)
mprintf("The diameter of the fifth bright ring is = %1.2f cm",D5)
//The answer provided in the textbook is wrong.
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