reflecting telescope optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece
refracting telescope optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece
Newtonian telescope reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis
radio telescope astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources
Gregorian telescope a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
Galilean telescope a type of refracting telescope that is no longer used in astronomy
Herschelian telescope a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed
Cassegrainian telescope a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
walking delegate a union representative who visits workers at their jobs to see whether agreements are observed
reflecting causing reflection or having a device that reflects
coude telescope a reflecting telescope so constructed that the light is led to a plate holder or spectrograph
reflectance the fraction of radiant energy that is reflected from a surface
eclectic selecting what seems best of various styles or ideas
reflex angle an angle greater than 180 degrees (but less than 360)
electron microscope a microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light
reflectiveness the capability of quiet thought or contemplation
optical telescope an astronomical telescope designed to collect and record light from cosmic sources
Maksutov telescope reflecting telescope in which the aberration of the concave mirror is reduced by a meniscus lens
Schmidt telescope reflecting telescope that has plate that corrects for aberration so a wide area of sky can be photographed
electroscope measuring instrument that detects electric charge