Document ID: chunk:federal_register_of_legislation:F2024C00147:body:0:p64
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reference standard mirror of E per cent reflectance, then, with a mirror of unknown reflectance, nx divisions will correspond to a reflectance of X per cent, given by the formula:

          Figure 2 - Generalized reflectometer, incorporating an integrating sphere in the receptor.

SPECTRAL TRISTIMULUS VALUES FOR THE CIE 1931 STANDARD COLORIMETRIC OBSERVER [1/]
 (This table is taken from CIE Publication 50(45) (1970))
   λ                              x ( λ )                 ( λ )                  ( λ )      nm
 380 0.001 4 0.000 0 0.006 5
 390 0.004 2 0.000 1 0.020 1
 400 0.014 3 0.000 4 0.067 9
 410 0.043 5 0.001 2 0.207 4
 420 0.134 4 0.004 0 0.645 6
 430 0.283 9 0.011 6 1.385 6
 440 0.348 3 0.023 0 1.747 1
 450 0.336 2 0.038 0 1.772 1
 460 0.290 8 0.060 0 1.669 2
 470 0.195 4 0.091 0 1.287 6
 480 0.095 6 0.139 0 0.813 0
 490 0.032 0 0.208 0 0.465 2
 500 0.004 9 0.323 0 0.272 0
 510 0.009 3 0.503 0 0.158 2
 520 0.063 3 0.710 0 0.078 2
 530 0.165 5 0.862 0 0.042 2
 540 0.290 4 0.954 0 0.020 3
 550 0.433 4 0.995 0 0.008 7
 560 0.594 5 0.995 0 0.003 9
 570 0.762 1 0.952 0 0.002 1
 580 0.916 3 0.870 0 0.001 7
 590 1.026 3 0.757 0 0.001 1
 600 1.062 2 0.631 0 0.000 8
 610 1.002 6 0.503 0 0.000 3
 620 0.854 4 0.381 0 0.000 2
 630 0.642 4 0.265 0 0.000 0
 640 0.447 9 0.175 0 0.000 0
 650 0.233 5 0.107 0 0.000 0
 660 0.164 9 0.061 0 0.000 0
 670 0.087 4 0.032 0 0.000 0
 680 0.046 8 0.017 0 0.000 0
 690 0.022 7 0.008 2 0.000 0
 700 0.011 4 0.004 1 0.000 0
 710 0.005 8 0.002 1 0.000 0
 720 0.002 9 0.001 0 0.000 0
 730 0.001 4 0.000 5 0.000 0
 740 0.000 7 0.000 2 [2/] 0.000 0
 750 0.000 3 0.000 1 0.000 0
 760 0.000 2 0.000 1 0.000 0
 770 0.000 1 0.000 0 0.000 0
 780 0.000 0 0.000 0 0.000 0
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EXPLANATORY FIGURE

Example of device for measuring the reflection factor of spherical mirrors

C = Receiver

D = Diaphragm

E = Window of entry

F = Window of measurement

L = Lens

M = Object window

S = Light source

(S) = Integrating sphere

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       Annex 6

PROCEDURE FOR DETERMINING THE RADIUS OF CURVATURE "r" OF A MIRROR'S REFLECTING SURFACE

       1. Measurements

       1.1. Equipment

        The "spherometer" described in figure/1 is used.

       1.2. Measuring points

       1.2.1. The principal radii of curvature shall be measured at 3 points situated