You must look in between the primary colors.
In between blue and yellow, there will be three colors but the one in the middle is the complementary (Green)
The amount of light that passes through the lens and reaches the digital sensor is called exposure.
So, exposure determines how much light or darkness will get to the sensor, and thus how light or dark the image will be when you take a photo. There are settings that are responsible for this: ISO, aperture, and shutter speed - which together are called "the exposure triangle."
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Here's one for you too! <3
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