A real image is what exsists when two light rays come together to display this image. It is the point at which the rays can caonnect and then reflect to the viewer's eyes. Only a true "real image" can be projected onto a screen. Photo images are pruduced by the relationship between the duration and intensity of light which is entitled: reciprocity. This concept states that exposure = time x intensity when the lens of a camera is in normal range.

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