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THE PHOTOMETRY OF OPTICAL SYSTEMS AND THE PROJEC
THE TESTING OF OPTICAL INSTRUMENTS
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achromatic Airy disc amplitude anastigmat angle angular aperture angular subtense aplanatic apochromatic apparent brightness astigmatism axes axial axis B.Sc beam binocular centre chromatic aberration colour coma components condenser convergence corrected corresponding curvature diagram diameter diaphragm diffraction direction distance distortion divergence doublet effect Electrical Engineering entrance pupil equation exit pupil eye pupil eyepiece field flint focal length focal plane formula fringes glass grating Hence illumination incident instrument lenses limit magnification maxima measured millimetres mirror numerical aperture object and image object plane oblique observation obtained optical path difference optical system ordinary parallel paraxial perpendicular Petzval surface phase photographic plate position possible practice principal ray prism projection lens radiated radius reflecting reflector refractive index represented result sagittal Second Edition shown in Fig sin2 sine condition source of light spherical aberration stereoscopic stop subtended symmetrical telephoto telescope objective theory thin lens tion usually visual wave-length zone