blob: 8a60fce0d378631c0e22ece7d5debc85424e3e02 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
// Scilab Code Ex3d.4: Page-206 (2008)
clc; clear;
lambda1 = 5890e-008; // Wavelength of D1 line of sodium lamp, cm
lambda2 = 5896e-008; // Wavelength of D2 line of sodium lamp, cm
d_lambda = lambda2 - lambda1; // Wavelength difference, cm
w = 0.5; // Width of the grating, cm
N = 2500; // Total number of grating lines
N_prime = N/w; // Number of lines per cm, lines/cm
a_plus_b = 1/N_prime; // Grating element, cm
n = 1; // Order of diffraction
// Case 1
theta = asind(n*lambda1/a_plus_b); // Angle of diffraction for D1 line, degree
// Case 2
theta_prime = asind(n*lambda2/a_plus_b); // Angle of diffraction for D2 line, degree
printf("\nThe angle of diffraction for D1 and D2 lines of sodium are %5.2f dgree and %5.2f degree respectively.", theta, theta_prime);
// From the condition for just resolution, lambda/d_lambda = n*N, solving for N
N_min = lambda1/(d_lambda*n); // Minimum number of lines required on the grating
if N_min < N then
printf("\nThe two lines are well resolved.");
else
printf("\nThe two lines are not resolved.");
end
// Result
// The angle of diffraction for D1 and D2 lines of sodium are 17.13 dgree and 17.15 degree respectively.
// The two lines are well resolved.
|
