e side of the axis of the tube; image appears erect, being reversed with and the injury to definition, on this ac- regard to T, which is itself reversed with count, is so great that the " front view '' respect to the object. (3). The Cassegrainian Telescope. — plan has been almost entirely aban-… … shown in (Fig. 12). AB is the specu- its principal focus t. If CD be removed, lum. A little beyond the image T, and the axis GcE directed to Q in the which is formed in the axis OT, is a object PQ, an inverted image TV, termin- ated by the lines QET and PEV, is small concave mirror CD. T is, with…
Engineering
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