[填空题]
(a) Suppose for a conventional X-ray image that tpqcyqx w1t l.)v64g5 the Xuq m8r8rb1dn ymi( 59lv+m h;s-ray beam consists of parallel rays. What would be the magnification of the image? a the 1 ud85sm(rh nl;9b8 qm+imrvymagnification is
(b) Suppose, instead, the X-rays come from a point source (as in Fig. Below) that is 15 $cm$ in front of a human body 25 $cm$ thick, and the film is pressed against the person’s back. Determine and discuss the range of magnifications that results. $m_1$ = the magnification is
