A Treatise on Optics |
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A. W. VERRALL aberration achromatic angle of incidence angular aperture axis bright caustic centre coincides College colours concave converge convex lens cos² curve diameter distance diverging edge ELEMENTARY emergence equal equation excentrical eye-glass eye-piece Fcap field of view focal length foci geometrical focus glass GREEK illumination image formed inches incident pencil index of refraction ISAAC TODHUNTER lenses LL.D luminous point M.A. BOOK magnifying power medium object object-glass parallel rays passing pencil pencil of parallel pencil of rays perpendicular placed plane mirror plane surface position Pott 8vo principal focus principal plane prism Prof Professor radii radius rays incident reflected or refracted reflected rays refracted pencil refracting angle refracting surface refractive index shew small pencil spectrum sphere spherical reflector spherical surface subtends supposed tion Translated TREATISE V₁ αμ