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--- |
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title: 'The 5 laws of geometrical optics' |
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media_order: 'interaction_lumiere_surface_3.gif,Opt_Geo_refle_lim.gif,Loi_reflexion.png,Opt_Geo_loi_refrac.jpg' |
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--- |
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###The 5 laws of light rays optics |
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**Fermat's principle $\Longrightarrow$ 5 las of light rays optics** |
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##### Propagation of light is rectilinear |
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In an homogenous and isotropice medium for its optical properties, light rays propagate in straight lines. |
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##### Light rays do not interact with each other |
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##### Law of reflection |
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<!--Comment for a fursther step : |
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Rays are geometrical constructions that indicate the direction of flow of the luminous energy |
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- in an homogenous medium, rays are stright lines. |
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- in an isotropic medium, rays |
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--> |
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* The **reflected ray** *belongs to the incidente plane*, and is*located in the opposite side to that of the incident ray*, with regard to the normal of the surface at the impact point. **The angle of reflection $r$ is equal to the angle of incidence $i_1$ : |
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$r=i_1$** |
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##### Law of refraction |
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[](https://www.geogebra.org/material/iframe/id/bg5ewxee) |
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