[填空题]
(a) An object 34.5 cm in fr xys hq1rruybe/qz zx4po8 ) doh()*91*kd rz1el4pb8 ont of a certain lens is imaged 8.20 cm in front of that lens (on the same side as the object). What type of lens is this, and what is its pzebk 8r41*dlfocal length? Is the image real or virtual? cm (diverging)
(b) If the image were located, instead, 41.5 cm in front of the lens, what type of lens would it be and what focal length would it have? cm (converging)
