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Meniscus corrector
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<p>A meniscus corrector is a <a href="/facts/Lens_(optics)/ejlH6n5c">negative meniscus lens</a> that is used to correct <a href="/facts/Spherical_aberration/x7V1JMQ9">spherical aberration</a> in <a href="/facts/Image-forming_optical_system/mL4p2V3v">image-forming optical systems</a> such as <a href="/facts/Catadioptric_telescope/vzJ2FulL">catadioptric telescopes</a>. It works by having the equal but opposite <a href="/facts/Spherical_aberration/x7V1JMQ9">spherical aberration</a> of the <a href="/facts/Objective_(optics)/6smChS48">objective</a> it is designed to correct (usually a <a href="/facts/Spherical_mirror/X1c0aVmK">spherical mirror</a>). </p>