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	<title>Transmittance - Revision history</title>
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	<updated>2026-04-28T20:09:20Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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		<id>https://www.iala.int/wiki/dictionary/index.php?title=Transmittance&amp;diff=6605&amp;oldid=prev</id>
		<title>Oferiks: 1 revision</title>
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		<updated>2009-03-01T10:01:03Z</updated>

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		<author><name>Oferiks</name></author>
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		<id>https://www.iala.int/wiki/dictionary/index.php?title=Transmittance&amp;diff=6604&amp;oldid=prev</id>
		<title>Oferiks: 1 revision</title>
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		<updated>2009-02-25T10:00:06Z</updated>

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		<author><name>Oferiks</name></author>
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		<title>Oferiks: 1 revision</title>
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		<author><name>Oferiks</name></author>
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		<id>https://www.iala.int/wiki/dictionary/index.php?title=Transmittance&amp;diff=1483&amp;oldid=prev</id>
		<title>Oferiks at 12:00, 15 February 2009</title>
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		<updated>2009-02-15T12:00:00Z</updated>

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&amp;#039;&amp;#039;&amp;#039;2-1-185&lt;br /&gt;
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Alternative term: Transmission Factor&lt;br /&gt;
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The ratio of the transmitted luminous flux (Ft) to the incident flux (Fo).&lt;br /&gt;
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Symbol: T&lt;br /&gt;
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Note: Where mixed transmission occurs, the (total) transmittance may be divided into two parts, Regular Transmittance (T r) and Diffuse Transmittance (Td),corresponding respectively to the  two  modes of  transmission  referred to in  2-1-170  and  2-1-175.&lt;br /&gt;
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T = T r+ Td&lt;br /&gt;
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Reference: C.I.E. (modified)&lt;br /&gt;
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{{IALAFooter}}&lt;br /&gt;
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{{languages|Transmittance}}&lt;br /&gt;
[[Category:2.1 Optics and Vision]]&lt;br /&gt;
[[Category:Alphabetical Index]]&lt;br /&gt;
[[Category:IALA Dictionary 1970-89 Edition]]&lt;/div&gt;</summary>
		<author><name>Oferiks</name></author>
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