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	<title>Inverse Square Law - Revision history</title>
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	<updated>2026-06-09T22:19:45Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://www.iala.int/wiki/dictionary/index.php?title=Inverse_Square_Law&amp;diff=6487&amp;oldid=prev</id>
		<title>Oferiks: 1 revision</title>
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		<updated>2009-03-01T10:00:43Z</updated>

		<summary type="html">&lt;p&gt;1 revision&lt;/p&gt;
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				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 10:00, 1 March 2009&lt;/td&gt;
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		<author><name>Oferiks</name></author>
	</entry>
	<entry>
		<id>https://www.iala.int/wiki/dictionary/index.php?title=Inverse_Square_Law&amp;diff=6486&amp;oldid=prev</id>
		<title>Oferiks: 1 revision</title>
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		<updated>2009-02-25T10:00:04Z</updated>

		<summary type="html">&lt;p&gt;1 revision&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 10:00, 25 February 2009&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l8&quot;&gt;Line 8:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 8:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;In this form, the cosine law of illuminance is also expressed.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;In this form, the cosine law of illuminance is also expressed.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
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		<author><name>Oferiks</name></author>
	</entry>
	<entry>
		<id>https://www.iala.int/wiki/dictionary/index.php?title=Inverse_Square_Law&amp;diff=1436&amp;oldid=prev</id>
		<title>Oferiks: 1 revision</title>
		<link rel="alternate" type="text/html" href="https://www.iala.int/wiki/dictionary/index.php?title=Inverse_Square_Law&amp;diff=1436&amp;oldid=prev"/>
		<updated>2009-02-25T00:00:04Z</updated>

		<summary type="html">&lt;p&gt;1 revision&lt;/p&gt;
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				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 00:00, 25 February 2009&lt;/td&gt;
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		<author><name>Oferiks</name></author>
	</entry>
	<entry>
		<id>https://www.iala.int/wiki/dictionary/index.php?title=Inverse_Square_Law&amp;diff=1435&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;2-1-065&lt;br /&gt;
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A formula relating the illuminance (E) produced on a plane surface element at a given distance (x) from a light source to the luminous intensity (I?1) of the source in the direction of the element. If the normal to the element makes an angle ?2 with the direction of the incident light, the law may be expressed as&lt;br /&gt;
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(Equation)&lt;br /&gt;
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In this form, the cosine law of illuminance is also expressed.&lt;br /&gt;
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[[Image:Ch2_Fig4.jpg|400px]]&lt;br /&gt;
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{{IALAFooter}}&lt;br /&gt;
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{{languages|Inverse Square Law}}&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>
	</entry>
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