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Uses the sine law of refraction to calculate the axis-intercepts of rays incident at
1â², 1°, and 1° 35â² 29â³ (the very edge of the glass).
Convex surface of lens is directed towards the </s>
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<head xml:space="preserve" xml:lang="lat">
Bulkely. De refractionibus per
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segmentum sphæræ
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[
<emph style="bf">Translation: </emph>
On refractions through a segment of a glass ]</head>
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Pro concursu radiorum