Sentence Examples


  • Thus if a horizontal slit is illuminated by an arc lamp, and the light - rendered parallel by a collimating lens - is transmitted through the sodium tube and focused on the vertical slit of a spectroscope, the effect of the sodium vapour is to produce its refraction spec trum vertically on the slit.
  • If the source be a point or a line, and a collimating lens be used, the incident waves may be regarded as plane.
 
 

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