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Category Archives: Letter 39

Spinoza’s Blunder and the Spherical Lens

Did Spinoza Understand the Law of Refraction?   In seeking to uncover the nature of Spinoza’s lens-grinding practices, and the competence of his optical knowledge, I believe I may have uncovered another small, but perhaps significant mis-translation of the text. The text is letter 39, written to Jelles (March 1667)), wherein Spinoza explains the insufficiency of Descartes treatment of [...]

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