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122
spherules, supposing the least distance of distinct vision to be 7 inches, and the object to be placed (l) at the focus, (2) at the least distance for distinct vision.
Focal length in terms of an inch. |
No. of times that the length of the object is magnified. |
No. of times that the surface is magnified. | ||
.10 | 007.00 | 008.00 | 000049 | 000064 |
.75 | 009.33 | 010.33 | 000087 | 000107 |
.50 | 014.00 | 015.00 | 000196 | 000225 |
.40 | 017.50 | 018.50 | 000306 | 000342 |
.30 | 023.33 | 024.33 | 000544 | 000592 |
.20 | 035.00 | 036.00 | 001225 | 001296 |
.15 | 046.66 | 047.66 | 002181 | 002276 |
.10 | 070.00 | 071.00 | 004900 | 005401 |
.05 | 140.00 | 141.00 | 019600 | 019881 |
.03 | 233.33 | 234.33 | 054289 | 054912 |
.02 | 350.00 | 351.00 | 122500 | 123201 |
.01 | 700.00 | 701.00 | 490000 | 491401 |
The next Table is for a person whose least distance of correct vision is 5 inches.
Focal length in terms of an inch. |
No. of times that the length is magnified. |
No. of times that the surface is magnified. | ||
.10 | 005.00 | 006.00 | 000025 | 000036 |
.75 | 006.67 | 007.67 | 000044 | 000058 |
.50 | 010.00 | 011.00 | 000100 | 000121 |
.40 | 012.50 | 013.50 | 000156 | 000195 |
.30 | 016.67 | 017.67 | 000278 | 000312 |
.20 | 025.60 | 026.00 | 000625 | 000676 |
.15 | 033.33 | 034.33 | 001111 | 001179 |
.10 | 050.00 | 051.00 | 002500 | 002601 |
.05 | 100.00 | 101.00 | 010000 | 010201 |
.03 | 166.67 | 167.67 | 027779 | 028110 |
.02 | 250.00 | 251.00 | 062500 | 062901 |
.01 | 500.00 | 501.00 | 250000 | 251001 |