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what distance should be kept constant in a camera: distance of image, di, the distance of the object, do, or focal point? why?​

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Answer:

The object distance is the distance of the object to the centre line of the lens. This is denoted by the symbol

doo

The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens. This is denoted by the symbol

di

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