Figure 21. A beam of light directed to one focus of the hyperbola and reflected towards the other focus of the hyperbola

From

The Experimental Teaching of the Conics Using the Reflection of the Light: The Conceptual Study of the Cassegrain Telescope

Juan Carlos Ruiz Mendoza

American Journal of Educational Research. 2019, 7(10), 699-707 doi:10.12691/education-7-10-5