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aberration absorption aerial Airy disc angle angular antenna aperture array astronomical atmosphere atoms band beam birefringent brightness collimator components cosmic rays curve density detection detectors device diameter diffraction dipole discussed dispersion distance effect electrons emission emulsion energy equation exposure eyepiece filter focal length focal ratio frequency fringes given grating illuminated image structure incident infrared instrument intensity layer lens light magnetic field magnitude measured method Michelson interferometer mirror neutrino noise normal object observing obtained occultation optical axis output particle path difference photographic photometer photometric system photomultiplier photons plate point source position prism produced pulse radar radiation radio reduced reflection refractive index region resolution right ascension rotating scanning Schematic scintillation secondary seconds of arc sensitivity separation shown in figure signal slit solar spectral type spectroscope spectrum star stellar surface technique telescope temperature usually valence band velocity voltage wavelength width Zeeman effect