## A System of Optics, Volume 1 |

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### Contents

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### Common terms and phrases

Achromatic angle of incidence angle of refraction appears approximate value axis circle of aberration circle of least concave consider convex convex lens convexo-plane crown glass curvature deviation diameter distance emergent pencil equal equation focal length foci focus former formula given pencil glass incident pencil incident rays index of refraction least circle least confusion lens lenses Let QA Fig manner meniscus mirror obliquity is small origin parabola parallel rays pencil converges pencil diverge pencil of parallel pencil of rays pencil passes plane surface plano-convex plano-convex lens point Q positions Primary Plane prism produced Prop Q and q radius ratio rays passes reflected pencil reflected ray reflexion refracting power represent right angles second approximation second surface secondary focal line Secondary Plane sine sphere spherical surface supposed takes place thickness triangles whole pencil