Difference between revisions of Optics related math
→From 20/20 prescription: got a bit sloppy with signs |
→From blur horizon of naked eye: fixing signs |
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For differentials to use a screen at, say, 50cm, just use <math>\frac{1}{f} = \frac{1}{0.50} + -\frac{1}{0.20} = -3D</math>. | For differentials to use a screen at, say, 50cm, just use <math>\frac{1}{f} = \frac{1}{0.50} + -\frac{1}{0.20} = -3D</math>. | ||
(Which is consistent with the previous version, | (Which is consistent with the previous version, adding 2D to the calculated full correction of -5D.) | ||
==Point of refraction== | ==Point of refraction== | ||