070 am
A, Pin
ago
040
050
0.45
055
5.1. PHOTOMETRY AND GEOMETRICAL OPTICS
• Spectral response of an eye V 00 is shown in Fig. 5.1.
V
1.0
0.8
0.5
0.4
a2
Fig. 5.1.
A=1.5melm
far ii..-0.555,um
PART FIVE
OPTICS
• Luminous intensity I and illuminance E:
dcto. 71C
dC2 '
dS •
• Illuminance produced by a point isotropic source:
I cos a
E —
r2
where a is the angle between the normal to the surface and the direction to the
source.
• Luminosity M and luminance L:
del) emit
clil
=
L— dt1 AS cose •
(5.1c)
M
dS ,
• For a Lambert source L = const and luminosity
M = aL.
(5.1d)
(5.1a)
(5.1b)
A, Pin
ago
040
050
0.45
055
5.1. PHOTOMETRY AND GEOMETRICAL OPTICS
• Spectral response of an eye V 00 is shown in Fig. 5.1.
V
1.0
0.8
0.5
0.4
a2
Fig. 5.1.
A=1.5melm
far ii..-0.555,um
PART FIVE
OPTICS
• Luminous intensity I and illuminance E:
dcto. 71C
dC2 '
dS •
• Illuminance produced by a point isotropic source:
I cos a
E —
r2
where a is the angle between the normal to the surface and the direction to the
source.
• Luminosity M and luminance L:
del) emit
clil
=
L— dt1 AS cose •
(5.1c)
M
dS ,
• For a Lambert source L = const and luminosity
M = aL.
(5.1d)
(5.1a)
(5.1b)