refracting telescope optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece
reflecting telescope optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece
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
radio telescope astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources
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
Newtonian telescope reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis
coude telescope a reflecting telescope so constructed that the light is led to a plate holder or spectrograph
refractive index the ratio of the velocity of light in a vacuum to that in a medium
refractiveness the physical property of a medium as determined by its index of refraction
operating microscope binocular microscope used in surgery to provide a clear view of small and inaccessible parts of the body (as in microsurgery)
optical telescope an astronomical telescope designed to collect and record light from cosmic sources
Galilean telescope a type of refracting telescope that is no longer used in astronomy
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
solar telescope a telescope designed to make observations of the sun
refractile of or relating to or capable of refraction
astronomical telescope any telescope designed to collect and record electromagnetic radiation from cosmic sources
refractoriness the trait of being unmanageable
refractometer measuring instrument for measuring the refractive index of a substance