## The testing and properties of optical instruments |

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aberration is positive angular aperture ratio astigmatism Axial chromatism axis brightness Bureau of Standards Circular coefficients of refractive coma cone of light CORRECTED LENSES Correcting a lens Curvature of Field Definition tests diameter diffusion of image distances of object distortion eliminated entrance pupil equivalent focal length eye point eye pupil field angle field curvature field glasses fifth decimal place fluid following tests fourth decimal place full opening give Hence illumination of image image distance image surface larger field Lateral diffusion length of objective Lens Testing light cone light entering limits of tolerance magnifica microscope objectives Middle of double minute of arc normal magnification numerical aperture objective and ocular Opera glasses photographic objectives photographic plate properties rays refractive index REFRACTOMETRY Relative illumination residual aberration retina simple lens single lens spherical aberration telescopic systems Temperature coefficients terrestrial ocular theoretical resolving power tion visual angle visual observation wave lengths wide angle