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<p>Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb.
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<br>Subjects: rays; light; plane; angle; ray; polarized; refraction; angles; image; distance; luminous point; principal focal; focal distance; principal focus; polarized light; white light; refracting angle; focal distances; virtual image; refracting angles</div>
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Isaac Wilber Jackson</div>
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