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Use "telescopes" in a sentence
"Those telescopes, in which the observer, placed at the anterior extremity of the tube, looks direct into the tube and turns his back to the objects, were called by Herschel _front view telescopes_."
"A problem with this kind of telescopes is that the flux of muons from the cosmic ray interactions in the sky above the telescopes is by far larger than the expected amount of muons from neutrino interactions."
"The positive refractive indices of normal materials necessitate the use of curved lenses, which inherently distort some of the light that passes through them, in telescopes and microscopes."