1. Camera Obscura is known as a 'dark chamber' because to see the projected image there must be no light coming in other than the light from the lens. It works by the image coming in through the lens and being projected onto the back of the box.
2. It is speculated that he used one because of the ease that it gave painters, and how detailed the paintings could be.
3. He would choose to use it because it makes painting a lot easier since you can already see the image and then simply copy it onto the canvas. I don't think it reduces his value as an artist, but as a painter because he still had a very skilled artistic eye, but his paintings were more photographs that he copied than if he just looked at his subjects and painted them.
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