Assertion: newtonian telescope | /r/HasAspect | an aspheric corrector lens
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Source sentences:
text: They have a concave spherical primary mirror and an aspheric corrector lens placed near the entrance aperture of the telescope tube.
text: In particular, the typical Schmidt-Newtonian telescope has a concave spherical figure primary mirror and an aspheric corrector lens placed near the entrance aperture of the telescope tube.