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<p>accurate rendering of perspective.A camera lucida is somewhat similar in mechanism to a <a href="page.php?w=periscope">periscope</a>. However it completes two <a href="page.php?w=total_internal_reflection">total internal reflections</a>, generally within a single glass parallellepiped or rhomboid that works as a double <a href="page.php?w=Prism_%28optics%29">prism</a>. This causes a shifted (<a href="page.php?w=parallax">parallax</a>-like) image of the pencil tip that overlaps with the microscopic field of vision. Then the microscopist traces</p><p>
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