四、小计算公式 sin/l sin u n 'sin l=nsin l (2) L′=u+I-I u=uti (3) r(1+sin/ 7-=r(1+ sIn lu=lu=h(5 - A A四、小L计算公式 u r l r i − = (1) i n n i   = (2) u = u +i −i (3) (1 ) u i l r    = + (4) lu = lu = h (5)  u r L r sin I sin − = u = u + I − I ) sin sin (1 u I L r    = + n'sin I' = nsin I  I -u u’ -L L’ r y A -y’ E C I’ A’