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Ray optics conceptual question
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[QUOTE="Cutter Ketch, post: 6053020, member: 515910"] “Magnification” can be used a couple of ways. They all can be related back to the idea of image to object ratio, but sometimes when designing an optical system it is useful to note other things that also relate to magnification. Picture the usual single lens diagram with a magnified real image. You see the difference in the size of the object and image. However do you also notice the angle between the rays at the object and image? The ratio of the angles is also the magnification. That’s how you can show single points and still talk about magnification. If you had more than one field point the distance between them would be magnified. Now consider an afocal telescope. The rays coming in and going out are parallel. We can see the magnification both in the decreased size of the pupil and the increased size of the angles. The more common meaning of magnification appears when you put your eye behind the telescope and the magnification translates to the apparent spacing of the objects. Note that here with the objects at infinity it becomes hard to use the object size/image size definition and the angles are the best way to define it [/QUOTE]
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