Revision: | 1.1 |
Committed: | Sat Feb 22 02:07:21 2003 UTC (21 years, 3 months ago) by greg |
Branch: | MAIN |
CVS Tags: | rad5R2, rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R5, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1 |
Log Message: | Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release |
# | User | Rev | Content |
---|---|---|---|
1 | greg | 1.1 | { |
2 | These formulas compute the index of refraction and | ||
3 | normal transmission for a pane of glass given the | ||
4 | measured normal transmittance and reflectance values, | ||
5 | Tn and Rn, respectively. | ||
6 | |||
7 | These formulas are approximate -- the exact solution | ||
8 | involves a quartic equation and seemed more trouble | ||
9 | than it was worth. If you know the index of refraction, | ||
10 | you are better off with the formula in trans.cal. | ||
11 | |||
12 | Oct. 2002 Greg Ward | ||
13 | } | ||
14 | { formula for normal transmission } | ||
15 | tn = Tn / (1 - Rn); | ||
16 | F = Rn / (1 + tn*tn); | ||
17 | n = (1 + sqrt(F)) / (1 - sqrt(F)); |