Here is an exercise you can do to get more in touch with the process of dark adaptation. Find a dark place where
you can make some observations as you adapt to the dark. A closet is a good place to perform this because you can regulate the intensity of light inside the closet by opening and closing the door. The idea is to design an environment in which there is dim light (no light at all, as in a darkroom with the safelight out is too dark). Take your textbook into the closet, with it opened to page 46. Close the closet door all the way so it is very dark, and then open the door slowly until you can just barely make out the white circle on the far left of Figure 2.39 but you can't see the others or see them as only being very dim. As you sit in the dark, become aware that your sensitivity is increasing by noting how the circles to the right in the figure slowly become visible over a period of 20 minutes. Also note that once a circle becomes visible, it gets easier to see as time passes. If you stare directly at the circles, they may fade, so move on your eyes around every so often. Also, the circles will be easier if you look slightly above them.
What were your experiences as you did this exercise? How could you apply it to a real life situation?
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