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@ -128,8 +128,8 @@ We call **thin spherical refracting surface** a spherical refracting surface *us |
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which defines $`\overline{SC}`$ : algebraic distance between vertex S and center C of curvature on optical axis. |
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* 2 refractive index values :<br> |
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\- **$`n-{inc} : refractive index of the medium of the incident light**.<br> |
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\- **$`n-{eme} : refractive index of the medium of the emergent light**. |
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\- **$`n-{inc}`$ : refractive index of the medium of the incident light**.<br> |
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\- **$`n-{eme}`$ : refractive index of the medium of the emergent light**. |
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* 1 arrow : indicates the *direction of light propagation* |
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* |
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