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436b - — — I The astronomical telescope consists of two...

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Unformatted text preview: —+— I The astronomical telescope consists of two converging lenses, with the first lens producing a real inverted image, which, taken as the object of the second lens, becomes an enlarged virtual image. I Adifference between the compound microscope and the astronomical telescope is that the real image produced by the objective lens is magnified in the com- pound microscope, but with the astronomical telescope, the rays from the ven,r distant object arrive parallel to the lens axis and cast a diminished real image right on the focal point of the objective lens. Furthermore, the tetescope is constructed so that the focus of the objective lens lands a distance in front of the evepiece equal to the evepiece's own focal length. This means that the diminished real image formed by the objective lens is transformed by the eyepiece into a magnified virtual image at infinity. The resulting total angular magnification equals the ratio of the focal lengths of the two tenses. I Astronomical telescopes constructed with mirrors avoid chromatic aberration, a problem associated with this type of telescope. Chromatic aberration results because glass refracts the various colors of light differentlv. TEETBDDHS SDMEi'lMEE FDRGEF TCII h'lEHTIDN Tl-IAT FIAT EILEEN CHF ASTRDHEIMICM. TELESCOPE HAVE Tfl' BE SOMEWHAT ST‘I'LIIED. THE FREE-LEM I5 OWNS A PICTURE 0F SOMETHING ‘-'.'rl‘lErIliTL‘iIr @ REDUCED B‘I’ THE FIRST LENE THEN GREATLY MHIFIED E‘I' THE SECGND. E EMS .J WHEEL ...
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