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Jun 29, 2021 at 11:00 vote accept Ben
Jun 29, 2021 at 10:17 history edited Qmechanic
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Jun 29, 2021 at 9:26 comment added joseph h See the answer below by Gandalf. Cheers.
Jun 29, 2021 at 9:24 answer added gandalf61 timeline score: 1
Jun 29, 2021 at 9:18 comment added Ben Well, does this mean, e.g., that, in the case of the sketch of the geometrical optics, one has an unclear image?
Jun 29, 2021 at 8:57 comment added joseph h Because that is what “in focus” means. Ie., when the image comes together on the retina. In the middle images they are not, so they are not in focus.
Jun 29, 2021 at 8:53 comment added Ben but why do I have a clear image, when the focus point is on the retina, like in picture 2?
Jun 29, 2021 at 8:37 comment added joseph h In geometric optics you can use two rays provided you have the focal point (and optic axis). I think all these images here are are for illustrative purposes only. Note that the last diagram has what you need to trace the image location (and only two rays are needed there).
Jun 29, 2021 at 8:21 history asked Ben CC BY-SA 4.0