[填空题]
What is the magnification /aa krfr1dix:x.0eo 2e4uqkhj (ff3)g;pr;g of an astronomical telescope whose objectivefg m5xl.pudi1l ; m0)e*t3scw lens has )x e 3u t1id0m .fl*5glsm;pcwa focal length of 76 $cm$ and whose eyepiece has a focal length of 2.8 $cm$? What is the overall length of the telescope when adjusted for a relaxed eye?
M = $\times$
L = $\times$
