"Optica Básica" serves as a crucial resource for:

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Geometrical optics treats light as rays that travel in straight lines. This is the foundation for lens and mirror design.

If light travels from a denser medium to a less dense medium ($n_1 > n_2$), there exists a critical angle ($\theta_c$) beyond which light is entirely reflected back into the denser medium. $$\sin \theta_c = \fracn_2n_1$$ Application: This principle is the basis for fiber optics and prism reflectors.