I. THẤU KÍNH – PHÂN LOẠI THẤU KÍNH: !"!#$#% &'()#*+,$- ./ !"!#$#% ,$-)0+,$-12% ,$-)3+,$-145% ,$-)0)5+,$-6+7 ,$-)3)5+,$-89$: ,$-6+7 ,$-89$: ;<+,$- = 1 ,$-2"'>45"-?,+2 #@A>! $-B+"CD EEFGHIJKLM NOP+9Q+RSTQ+R4< 7 " 8 7 7""- FT?+,$-U+9H"V+,$-D F7""- W5S+XSUH@5@Y'"@AB++,$- F7"87"!"S+X$!"SUH &!"++AUU+9HS++X O ,$-6+7 O Z[ Z Z[RST\"-+9 ] +% O Z Z[ ZRST@^+"-+9 ] +% ,$-89$: F F' F' F # # Z[RST\"-\#% ZRST@^+"-\#% Z[ N RST\87 F’ 1 Z N RST@^+87 F’ Z N Z R 4< R 4< Z Z[ Z_ Z # # EEFGHIJKLM NOP+9Q+RSTQ+R4< 7" "- 7 " 8 7 R4< Z N Z N Z[ N Z N [ = 1 (OR"`D6+7 a@A+,$-6+7bcdQcd 6+7 e N b 48%Sa8 beHZ[ R"` % a@A+,$-89$:bfdQfd "gh+,$-SB++#$Y$- e N b eFN%% N i N N i ( PA"$ j47"Y +k">Rl O Z[ Z # F F' EEEDImnHGPLoKLM NO!<\@5@^++#Pp" \ST $% @^+ST $% Zq Iq Zq Iq Iq\+^+ Iq\\# Z I I Z I@^++^+ I@^+\# (D&!"4`\+*#>r+,$- +ASUU+9H++XD +A # #@A+7""-Q+)'#B"S $s#45"V+)'%SU+RST\"-Z_D +A#B"S$s#45"V++A%SU+RST @^+"-ZQ+)' # #@A+7""-D B O F F’ B' F F’ t tq u(+#v+