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the article is about RTMA, no need to repeat the idea in each header |
→Matrix definition: citation needed for thermodynamics argument. |
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:<math>C = \left.\frac{\theta_2}{ x_1 } \right|_{\theta_1 = 0} \qquad D = \left.\frac{\theta_2}{\theta_1 } \right|_{x_1 = 0}.</math>
This relates the ''ray vectors'' at the input and output planes by the ''ray transfer matrix'' (RTM) '''M''', which represents the optical component or system present between the two reference planes. A [[thermodynamics]] argument based on the [[blackbody]] radiation {{Citation needed}} can be used to show that the [[determinant]] of a RTM is the ratio of the indices of refraction:
:<math>\det(\mathbf{M}) = AD - BC = \frac{n_1}{n_2}. </math>
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