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aberration achromatic angle of incidence angular aperture axis bright caustic centre coincides College colours concave converge convex lens curve diameter distance diverging edge ELEMENTARY emergence equal equation excentrical eye-glass eye-piece FASNACHT Fcap field of view focal length foci geometrical focus glass GREEK Gregorian telescope illumination image formed inches incident pencil index of refraction lenses Litt.D luminous point M.A. Cr magnifying power medium minimum deviation object object-glass parabola parallel rays passing pencil pencil of light pencil of parallel pencil of rays perpendicular placed plane mirror plane surface point of incidence point Q position Pott 8vo principal focus principal plane prism Prof Professor radii radius rays incident reflected or refracted reflected rays reflector refracted pencil refracting angle refracting surface refractive index seen shew small pencil spectrum sphere spherical reflector spherical surface subtends supposed thin lens tion Translated TREATISE