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Electrical Applications 2 by David W. Tyler

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Illumination 115
USE OF THE POLAR
DIAGRAM
-4
\
igure 7.15
Light
s" source
Mr
Opal finish
glass globe
(a)
Z ^"^^source
"c "* ^-~^P
/ Prismatic lens (random arrangement)
(b)
Refraction or bending of light rays takes place when they pass
through a prism as shown in Figure 7.1 The reflecting lantern or
luminaire is used for street lighting and in motor vehicle headlamps.
An array of prisms may be seen on the inside of
the
glass as shown in
cross-section in Figure 7.14. By a combination of these methods a
polar diagram of almost any shape can be produced enabling light to