The first steps for learning optics: Ibn Sahl's, Al-Haytham's and Young's works on refraction as typical examples

@inproceedings{Zghal2007TheFS,
  title={The first steps for learning optics: Ibn Sahl's, Al-Haytham's and Young's works on refraction as typical examples},
  author={Mourad Zghal and Hamid-Eddine Bouali and Zohra Ben Lakhdar and Habib Hamam},
  booktitle={International Topical Meeting on Education and Training in Optics and Photonics},
  year={2007}
}
Optics scholars did not only discover optical phenomena and laws governing them. Some of them also invented impressive optical systems and instruments or offered us techniques to juggle with optical signals and rays. One typical example of the impressive optical systems is the camera obscura invented by Ibn Al-Haytham. For techniques enabling us to easily handle optical rays, one can mention Young’s method to handle rays put into play by refraction. Nine centuries before him, Ibn Sahl proposed… 

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