https://wiki.pathfindersonline.org/index.php?action=history&feed=atom&title=Translations%3AAdventist_Youth_Honors_Answer_Book%2FHealth_and_Science%2FOptics%2F59%2Fen 2026-04-29T04:20:11Z Revision history for this page on the wiki MediaWiki 1.35.5 https://wiki.pathfindersonline.org/index.php?title=Translations:Adventist_Youth_Honors_Answer_Book/Health_and_Science/Optics/59/en&diff=295515&oldid=prev 2020-12-08T05:49:32Z

<p>Importing a new version from external source</p> <p><b>New page</b></p><div>==9. Construct one optical instrument using mirrors or lenses, such as a periscope, a slide or opaque projector, or a simple telescope.==<br /> ===Periscope===<br /> [[Image:Simpleperiscopes.png|thumb|350px|right|'''Principle of the periscope.'''&lt;br&gt;<br /> '''A''' - Periscope using two plane mirrors.&lt;br&gt; <br /> ''' B''' - Periscope using two right–angled prisms.&lt;br&gt;<br /> '''1 - 2''' - Plane mirrors.&lt;br&gt;<br /> '''3 - 4''' - Right–angled prisms.&lt;br&gt;<br /> '''5 - 6''' - Observer eye.&lt;br&gt;<br /> '''7 - 8''' - Periscope tube.&lt;br&gt;<br /> '''H''' - Periscope optical height.&lt;br&gt; <br /> '''Different types of periscopes:'''&lt;br&gt;<br /> Lens periscopes. [http://commons.wikimedia.org/wiki/File:Periscope_1.png]&lt;br&gt;Handheld periscope. [http://commons.wikimedia.org/wiki/File:Handheld_periscope.png]&lt;br&gt; Submarine periscope.[http://commons.wikimedia.org/wiki/File:Attack_periscope.png]]]<br /> A periscope is an instrument for observation from a concealed position. In its simplest form it is a tube in each end of which are mirrors set parallel to each other and at an angle of 45° with a line between them.</div>

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