II 



754 L. EULERI OPERA POSTHLMA. Physka. 



\\. Si lens ocitlaris adhibeatur triplicata, haec praecepta in ejus conslructione sequi convenlet: 



3 99 

 Dislantiae focales: 9 = ^^ /c = 2.9405 /c, Intervalla lentium: AB = u — A: = 99/c, 



*^5^^'' =0,7W2ft, CD=s = 0,7*62 A, 



iOl 



pro loco oculi distantia BO = ^—-s =0,25l2/c, 



oOO 



hinc tota tubi longitudo AO = 1 00,7^^36 ft, 



campi autem apparentis diameter erit 5l'. 



42. Si lens ocularis adhibeatur quadruplicata , ejus constructio ita erit institucnda: 



4.99 

 101 



^ 



Distantiae focales: q = -^k = 3,9208 Ar» Interv. lentium: AB = a — k = 99/c» 



-«I 



fi QQ 9Q0 9 QO _ 



'• = 1^'' =3,5331A:, BC = --^k = 0,398U. 



^^'if»''^^.'»*^^-- ^« = S* =0,7.G2A, 



'=797:499:50r* = <^'*^"''=' ^^=497.499.501^= "■'^3°^'^' 



101 



pro loco oculi distantia EO = ^—t =0,2172^, 



400 



hinc tota tubi longitudo AO = 100,7620/c, 

 campi autem apparentis dinmeter erit 1^8'. 



43. Si lens ocularis adhibeatur quintuplicata ^ his mensuris ejus constructio continetur: 



5 99 



Dist. focales: q=-j^k =4,9010A-, Interv. lentium: AB = a — k = 99/r, 



'•^Im^ =M063/c, ' BC = ^^k =O.U53^, 



5.99 1096.1000, 0^^,-1 ^n .99.1096, n oqaoi 



^== 4.298.1197.101 ^^-^'^^^^^'- ^^=4-:298ai97^ = 0,3 802 /c, 



5.99.1096.702, oproQi nir 5.99.1096, n oqao/ 



^== 4.298.1197.101 ^"=^>^^^^^> ^^=4:mTT97'^ - 0,3802 /c, 



5.99.1096.702, ^00001 rr 5.99.1096702, Arrr^/ 



"== 2.298.1197.601 ^="Q-^^^^^> ^^ = 4.298.1197.601 ^ =" ^^^^^^ ^- 



101 



pro loco oculi distantia FO =-—u =0,1794/:. 



' 50i) 



et tota tubi longitudo seu distantia AO = 1 00,7992 A, 



, I 

 campi vero apparcntis diameter erit 1^25 . 



g€ 



