·垂直光轴（⊥OA)干涉图的应用 ·确定轴性及切片方向 ·测定光性符号
⚫ 垂直光轴（⊥OA）干涉图的应用 ⚫ 确定轴性及切片方向 ⚫ 测定光性符号
升 试板 试板 十) N 图80一轴晶垂直光轴切面 图81一轴晶矿物光性符号的测定 干涉图中N。与N。的方位
GYPSUM PLATE In oppcsite quadramts of the Intsrference figure the Interference colours elther Increase or daoreesa Slovimn +Slovao=Increase Fasthin SloWaoe Decroase. Rsmember you are detsrmining whether eis the SLOW fast or slow ray. SLOW POSITIVE NEGATIVE
QUARTZ WEDGE NIth the quart位wedge It 下 Is the dlrectlon,away from or towards the melatope,of movement of the lsochromes as the wedge Is Inserted that asslsts In determlning the optic sign. SLOW SLOW In ths NE and SW quadrants of the In the NE and sw quadrants of the fgure the Isochromes move In. flgure the Isochrames move out. In the N and SE quadrants of the In the NW and SE quadrants of the figure the isochromes move out. figure the isochromes move in
(+) 云母试板 A B