eli5: Why there’s a difference between focusing your eyes on something distant and focusing your eyes on a screen projecting the image of something distant?
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Your eyes focus themselves to get a clear image of the object they are focussing on. Any object we can only see because light bounces off of the object and into our eyes. An image is just a bunch of light rays in a certain order bounced off of an object and into our eyes (or the light is sent out of the screen directly). Its that object that your eyes then focus on, not what is being projected on it. So that can be a picture of something far away, but because the camera that took that picture already did the focussing for you, now you can see the same as that camera did when it took the picture, but projected on an object that is closer than the image subject was to the camera.
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