Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 944
for the eyereceives now all rays whichhave been transmittedthrough a small central por-tion of the object—that por-tion which is conjugate to thepupil—and receives no otherrays). After this, focus thesame objective on an ordinary dry-mounted preparation (or on one which is connected with the… … 180° Water-angle.(1-33 Num. Ap.) 180° Air-angle.96° Water-angle.82° Oil-angle.(1-00 Num. Ap.) 97° Air-angle.(0-75 Num-Ap.) 60° Air-angle.(0-50 Num. Ap.) 85* APPENDIX. a dark annulus, visible by faint diffused light only.* The explana-tion of this experiment is, that in focussing an…
Microscopy · Biology
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