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Why do people see blue dots for a little while after looking a camera's flash?
Wiki User
∙ 16y ago
They are experiencing "afterimage." The following site explains the phenomenon and offers a simple experiment to demonstrate it: http://www.psychologie.tu-dresden.de/i1/kaw/diverses%20Material/www.illusionworks.com/html/afterimage.html The instructions are to stare at a picture of a black light bulb on t he computer screen and then to shift your gaze to a clear white section of the screen. In addition to that procedure, you can stare at the image as instructed and then close your eyes. In a few moments you will see the same result as you did when you stared at the white space. If you have a flash that you can fire, darken the room, set off the flash to light a nearby area that you are looking at (look at the area that the flash will light, not at the flash itself!), and then close your eyes. The afterimage phenomenon will entertain and instruct you. [spelvin]
Wiki User
∙ 16y ago
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