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Reference.org
Long-slit spectroscopy
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<p>In <a href="/facts/Astronomy/0ArJVM1p">astronomy</a>, long-slit spectroscopy involves observing a <a href="/facts/Astronomical_object/BCHLa0Q2">celestial object</a> using a <a href="/facts/Spectrograph/BjshQbA8">spectrograph</a> in which the entrance aperture is an elongated, narrow slit. Light entering the slit is then <a href="/facts/Refraction/S8kvSKzM">refracted</a> using a <a href="/facts/Prism_(optics)/eodBFF70">prism</a>, <a href="/facts/Diffraction_grating/TUcyt7Do">diffraction grating</a>, or <a href="/facts/Grism/7SYQXuHj">grism</a>. The dispersed light is typically recorded on a <a href="/facts/Charge-coupled_device/l6xffIcz">charge-coupled device</a> detector. </p>