Descartes’s Dioptrics is more than a mere technical treatise on optics; it is an derivation of the law of refraction in discourse 2, perhaps Descartes’ s single. Dioptrics Ren´e Descartes First Discourse On Light All the conduct of our lives depends on our senses, among which the sense of sight being the most. Dioptrics. Ren´e Descartes First Discourse On Light All the conduct of our lives depends on our senses, among which the sense of sight being the most.

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When Descartes then describes how the use of lens P accomplishes much the same type of action, here too is not mentioned that the size of the angle is increased during magnification.

Perhaps he was silent so as not to give any preference to the circle above other figures which he introduced; for there is not doubt that in this matter the circle surpasses all other figures that can be discovered letter 39 It is the 7th discourse that Spinoza and Desccartes are discussing. For, since it loses half its speed in passing through the cloth CBE, it must take twice as much time to pass below B to a point on the circumference of the circle AFD as it desvartes above to pass from A to B: It has nothing to do with phantasy, there is nothing to interpret.

Descartes continues, detailing the kinds of improvements of magnfication that are possible: Book titles OR Journal titles.

You can even easily decide the question among them concerning the origin of the action that causes the sense of sight. Built on the Johns Hopkins University Campus. From Wikipedia, the free encyclopedia. Email required Address never made public. And I do not wish to make you consider other things here, except that the surfaces of transparent bodies which are curved deflect rays which pass through each of their points, in the same way as would flat surfaces that could be imagined touching these bodies at the same points: Then, again, these same rays, in coming out of this tube, bend and straighten themselves in a such a manner that they can enter into the eye the same as if they had not been bent at all, as if they merely came from some nearer place.

The justification for this interpretation almost always involves citing one or another of a host of more or less obscure and often inconsistent references to ideas, their content, causes, resemblances or the lack of same to thoughts obscureimages, pictures, engravings, etc.


But Spinoza seems to have focused on what follows, which leaves off any concern for this factor:. Blocked, he comes upon nothing so fated. Journal of the History of Philosophy.

Dana on Conjoined Semiosis: Here is a portion of the relevant passage: The BwO causes intensities to pass; it produces and distributes them in a spatium that is itself intensive, lacking extension.

Remember me eescartes this computer. Finally, I wilt discuss the question of perceptual representationalism in Descartes and some remaining related issues.

DESCARTES – Dioptrics-On Light | Thiago Lédo –

Finally, consider that, if a moving ball encounters obliquely the surface of a liquid body through which it can pass more or less easily than through that which it is leaving, it is deflected and changes its course when it enters: And then, it is easy to understand that the encounter with the ground can only prevent one of these two determinations, and not in any way the other: Second Discourse On Refraction Inasmuch as we will later need to know the quantity of this refraction exactly, and since it can be understood easily enough by the comparison which I have just used, I believe that it is appropriate that I try here to explain it all at once, and that I first speak of reflection, in order to make the understanding of refraction so much the easier.

If tiny balls of glass [even drops of water] can work effectively as microscopic lenses, so much more does their ubiquitous efficacy seem to be enforced.

And it must be noted that the ball, aside from its simple and ordinary movement, which carries it from one place to another, can also have a second which makes it turn about its center, and that the speed of this latter can have many different proportions with the speed of the former. For the ratio or proportion which is between these angles varies at all the many inclinations of the rays, whereas that between lines AH and IG, or similar lines, remains the same in all the refractions caused by the same bodies.

Then, in order to know precisely to which among all the points of the circle it will return, let us draw three straight lines AC, HB and FE, perpendicular to CE, and in such a way that there is neither more nor less distance between AC and HB as between HB and FE; and let us say that in as much time as the ball has taken to advance to the right from A one of the points on the line AC to B one of the points on line HBit must also advance from line HB to some point on line FE: And Descartes brings up the point of their shape right away:.


It should be noticed that each of the above has expressed some hesitation over attributing to Descartes a clearly consistent or obvious doctrine of the relationship between ideas of sense and what or how they are supposed to represent. Notify me of new comments via email.


And certain cases can also be found where rays must curve, although they only pass through a single transparent body; in the same way as the movement of a ball curves, since it is deflected towards one direction by its weight, and towards another by the action with which it has been impelled, or for many other reasons.

This example will prevent you from thinking it strange that light can extend its rays in an instant from the sun to us; for you know that the action by which one end of the stick is moved must thus pass in an instant to the other, and that light must pass in the same way between the Earth and the heavens, even though there would be more distance.

Citiless is the one who with the un-beautiful dwells, boldly in grace. But, to the shame of our sciences, this invention, so useful and so admirable, was first found only by experiment and good fortune.

You are commenting using your Twitter account. Among these latter, some cause rays to reflect without causing any other change in their action, namely those that we call white; and others bring with this reflection a change similar to that received by the movement of a ball when it is grazed, namely those which are red, or yellow, or blue, or of any other such color.

Project MUSE – Did Descartes Have a Philosophical Theory of Sense Perception?

Finally, thanks are due to Professor Descarges Berger of U. Forged from a partnership between a university press and a library, Project MUSE is a trusted part of the academic and scholarly community it serves.

Singleton… on Spinoza Doubt? In fact Wilson wonders whether any philosophical causal or representational theory can be attributed to Descartes at all because his “meager” conclusions in the Meditations concerning this relationship are “too tenuous, too nearly void of cognitive significance.