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// Scilab code Ex4.34: : Pg:188 (2008)
clc;clear;
Lambda = 5896e-08; // Wavelength of light, cm
d = 0.3; // Path difference between the M1 and M2 mirrors, cm
r = 0; // For central bright fringe
// Since 2*d*cos(r) = n*Lambda and for r = 0 which gives 2*d = n*Lambda
// 2*d*cos_theta = (n-6)*Lambda, solving for theta
theta = acosd(1-6*Lambda/(2*d)); // Angular radius of the seventh bright fringe, degree
D = 2*theta; // Angular diameter of the seventh bright fringe, degree
printf("\nThe angular diameter of 7th bright fringe = %1.0f degree", D);
// Result
// The angular diameter of 7th bright fringe = 4 degree
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