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Why do we see colors? Light from the sun or from a lamp seems to have no particular color of its own. It appears simply to be "white" light. However, if you pass the light through a prism, you can see that it actually contains all colors, the same effect that occurs when water droplets in the atmosphere separate light into a rainbow.
submitted: 5 years and 3640 days ago
All exposure systems, including the one built into your digital camera, operate on the same general principles. A meter continuously measures the light reflecting from the subject and uses this measurement when you press the shutter button halfway down to calculate and set the shutter speed and aperture.
submitted: 5 years and 3640 days ago