Step 1:
We know that the effective length of the water-glass medium is given by the formula:
\[t_{\text{effective}} = \frac{t_w}{n_w} + \frac{t_g}{n_g}\]
where $t_w$ is the thickness of the water, $n_w$ is the refractive index of the water, $t_g$ is the thickness
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