## Alhacen on the Principles of Reflection: English translation |

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### Contents

ENGLISH TRANSLATION | 289 |

Book Five | 377 |

Analysis of Convex Spherical Mirrors | 403 |

Copyright | |

6 other sections not shown

### Common terms and phrases

Accordingly acute angle adjacent angle Alhacen angle AGD angle formed axis base bronze plaque center of sight centerpoint color common section cone cone's conic section conical mirror construction cylinder cylinder's diameter digits distance draw a line draw line ellipse endpoint equal to angle Euclid facing form of point half of angle Hence image-location intersect line Let it intersect Likewise line drawn line extended line of incidence line of longitude line of sight luminous midline midpoint mirror's surface Moreover normal dropped object-point orthogonal panel perceived perpendicular plane mirror plane of reflection plane tangent point E point G point of intersection point of reflection point on arc polished body previous conclusions proposition proposition 21 radiates radius reflected angle reflected to point reflection can occur reflection will occur right angle ring segment side sight lies similar to triangle sphere subtended tion vertex visible point visible portion