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Rectilinear Propagation of Light
Shadows Eclipses etc
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achromatic angle of incidence aperture astigmatism axial points bundle of rays chief ray colors concave lens conjugate points convex lens cornea corresponding crosses the axis curvature curved cylindrical denoted designate the positions deviation diameter direction distance dptr entrance-pupil equal equation exit-pupil field of view focal length focal plane formula front glass image-point inches incident ray index of refraction infinitely distant infinitely thin lens intersect lenses magnifying power medium meridian microscope normal object object-space obtain ocular optical axis optical instrument optical system pair of conjugate parallel paraxial rays path perpendicular plane mirror point F primary focal principal points principal section prism pupil radii radius reflected refracted ray refracting angle refracting power respectively retina right angles secondary focal side so-called spectrum spherical aberration spherical mirror spherical refracting surface spherical surface straight line telescope thin lens tion vertex wave-front wave-length waves