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Many Theories Through the Ages Methods of Dividing Luminous Radia
absorption approximately astigmatism atoms axis calculated called camera cells cent centre chief ray chromatic colour temperature cornea correction corresponding curvature curve degree of magnification density diameter diffraction dioptres distance distortion effect electron emission emitted emulsion energy entrance pupil equation exposure eyepiece film fluorescence focal length focal point formula give glass illumination image field image formation image point incandescent increased infra-red instruments lamps layer lens lenses light source lines luminous efficiency luminous flux luminous intensity measured medium metal method microscope mirror Nicol prisms object point obtained occurs optical system paraxial photo-electric photo-electric effect photographic lens photopic vision plane polarisation posterior principal point prism radiation reflection refractive index refractive power relatively resolving power retina rotation selenium sensitivity shown in fig shutter so-called spectral spectrum spherical aberration stilb substances telescope tion tive tube ultra-violet usually utilised velocity vergence visible vision visual acuity voltage wave motion wave-length whereby