A light source apparatus for generating parallel light is equipped with dual mirrors to compensate for a shadow cast by the lamp itself. The apparatus includes an elliptical reflector and a light source located at the near focal point of the elliptical reflector. A first mirror having an aperture in the center thereof, for reflecting rays emitted directly from the light source back toward the light source, and a second mirror positioned directly in front of the light source, for reflecting the rays reflected from the first mirror and passing the rays through the aperture of the first mirror are provided. A collimating lens is provided for forming parallel light by focusing the rays passed through the aperture of the first mirror, thereby being used as the light source or other element of an optical instrument which requires a highly uniform parallel light source.
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